The Great stupa at Sanchi was originally commissioned by the emperor:

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Accepted Answer

The correct option is (4):
The Great Stupa at Sanchi was originally commissioned by Emperor Ashoka the Great of the Mauryan Dynasty in the 3rd century BCE. Following his embrace of Buddhism, Ashoka embarked on a monumental project to propagate the religion by establishing numerous stupas across his vast empire, which were intended to enshrine the relics of the Buddha. The initial structure at Sanchi was a smaller, hemispherical dome built of brick, which served as the nucleus for the grand stone structure we see today. Ashoka's original commission marks the earliest phase of this UNESCO World Heritage site, making him the undisputed founder of the monument.

The incorrect option is (1):
Chandragupta Vikramaditya was a famous emperor of the Gupta Empire, who reigned roughly six centuries *after* Ashoka, in the 4th and 5th centuries CE. His era is known as the Golden Age of India, but its architectural and artistic focus was primarily Hindu. While a Sanchi stone inscription from his time exists, it relates to a later donation by a military officer for the monastic complex, not the original commissioning of the Great Stupa.

The incorrect option is (2):
Kanishka was a powerful emperor of the Kushana Dynasty who ruled around the 1st to 2nd century CE. Although Kanishka was a major patron of Buddhism and his reign saw the flourishing of the Gandhara and Mathura schools of art, the Sanchi Stupa was already a well-established site by his time. Kanishka’s most famous architectural legacy in Buddhism is the monumental Kanishka Stupa built at Purushapura (modern Peshawar).

The incorrect option is (3):
Harshavardhana was a significant ruler of the Vardhana Dynasty in the 7th century CE, more than a thousand years after the Stupa was founded. He is celebrated for his patronage of Buddhism and for his court hosting the Chinese pilgrim Xuanzang. His main centers of activity were in Northern India, particularly Kannauj, and his period is historically and geographically too distant to have commissioned the Stupa's original construction.