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

The correct option is Sarvastivada Vinaya.

Sanghabhuti was a renowned Indian Buddhist monk and scholar from Kashmir who travelled to China towards the end of the fourth century AD (around 381 AD). He was one of the early translators who helped introduce Abhidharma and Vinaya texts of the Sarvastivada school of Buddhism into China.
Upon his arrival in Chang'an, he was deeply revered and translated several important Buddhist texts into Chinese. Among his most notable works is a commentary on the Sarvastivada Vinaya (known as the Vinaya-vibhasha), which provided a detailed exposition of the monastic rules and discipline of the Sarvastivada school.

Let's briefly examine why the other options are incorrect:
- Prajnaparamita Sutra: This is a core Mahayana scripture focusing on the perfection of wisdom, translated by various other scholars like Kumarajiva, not authored as a commentary by Sanghabhuti.
- Visuddhimagga: This is a classic Theravada Buddhist manual written by Buddhaghosa in Sri Lanka during the 5th century AD, written in Pali.
- Lalitavistara: This is a Mahayana Buddhist sutra that tells the story of the Gautama Buddha's life, and is not a commentary authored by Sanghabhuti.