A stitch similar to but stronger than running stitch is :

Question

Accepted Answer

The correct option is 3:
The backstitch is correctly identified as the stitch that is similar to, yet significantly stronger than, the simple running stitch. Both are fundamental hand-sewing stitches used primarily for creating seams and outlines, sharing the basic characteristic of creating a linear path by passing the needle in and out of the fabric. However, the mechanism of the backstitch inherently provides superior durability. While the running stitch is discontinuous—leaving small gaps of unstitched fabric between the threads on the top layer—the backstitch involves taking one step back for every two steps forward. This 'backward' motion causes each new stitch to overlap or join the end of the preceding stitch on the top side of the fabric. This creates a dense, continuous line of thread that strongly interlocks the fabric layers, making it highly secure and resistant to pulling out or unraveling. Due to this overlapping, locked structure, the backstitch is often used to replace machine stitching for seams that must withstand significant wear-and-tear, making it the strongest basic hand-sewing stitch for joining two pieces of fabric.

The incorrect option is 1:
Visible hemming is a technique, not a stitch type in the same category as a running stitch or backstitch. Hemming is the method of folding and securing a raw edge, usually at the bottom of a garment, to prevent fraying and provide a neat finish. "Visible hemming" simply means the final securing stitches, like a straight stitch or a long running stitch, are evident on the outside of the finished garment. The purpose of hemming is to finish an edge, whereas the purpose of a running or backstitch is to create a primary, structural seam. Furthermore, the inherent strength of a visible hemming stitch is often equal to or less than a typical running stitch, as they are not specifically designed for high seam stress. Therefore, it is a finishing technique, not a stronger counterpart to the basic running stitch.

The incorrect option is 2:
Invisible hemming is the term for a finishing technique, typically done with a blind hem stitch, that is designed to be completely or nearly unnoticeable on the right side of the fabric. The technique involves catching only one or two threads of the main fabric at widely spaced intervals, making the stitch deliberately loose or small to achieve invisibility. Because the focus is entirely on hiding the thread, this technique is intentionally weak and unsuitable for structural seams that require strength. It cannot be considered a stronger version of the running stitch, as its fundamental design principle sacrifices durability for discretion. Invisible hemming would be one of the least strong methods of permanently securing two layers of fabric together.

The incorrect option is 4:
Interlocking refers to a broad conceptual mechanism or a class of stitches, rather than a specific, named hand stitch similar to the running stitch. In textiles, it most commonly refers to a type of knit construction (interlock knit) where two layers of stitches are created on one needle bed, producing a dense, double-knit fabric. Alternatively, in sewing machine terms, "interlocking" is descriptive of an overlock or serger stitch, where multiple threads loop over each other and the fabric edge to prevent fraying. Neither of these meanings—a type of fabric structure nor a specialized machine stitch—fits the requirement of a basic hand stitch that is a similar but stronger derivative of the running stitch. The term is too generic and contextually incorrect for the specific hand-sewing comparison requested.