Explanation: 1. Justification for Option 2 (18 and 24 months): - During the age range of 18 to 24 months, children typically experience a significant developmental milestone in language acquisition. This period is often referred to as the "language explosion" phase. During this time, children begin to combine words into short sentences, such as "more juice" or "big truck." This ability to form two-word combinations marks the beginning of syntactic…Read More