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

Sanghabhuti was a Kashmiri monk who traveled to China in the late 4th century and is credited with translating and commenting on the **Sarvastivada Vinaya**, introducing the disciplinary codes of the Sarvastivada school to the Chinese clergy. Option (b) is incorrect because the *Visuddhimagga* is a 5th-century Theravada text written by Buddhaghosa in Sri Lanka, not by a monk traveling to China. This question tests the core concept of the **propagation of Indian Buddhism** and the specific literary contributions of Indian scholars who facilitated the transmission of Dhamma to East Asia.