Which one of the following is a work attributed to playwright Bhasa?

Sanghabhuti, an Indian Buddhist monk, who travelled to China at the end of the fourth century AD, was the author of a commentary on:

With reference to ancient India, consider the following statements :

1. The concept of Stupa is Buddhist in origin.

2. Stupa was generally a repository of relics.

3. Stupa was a votive and commemorative structure in the Buddhist tradition.

How many of the statements given above are correct?