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

India and China developed cultural relations through the spread of Buddhism.

In the first century B.C., Buddhist monks Dharmaratna and Kasyapa Matanga traveled to China, translating Buddhist texts and preaching the religion.

By the third or fourth century A.D., Buddhism became popular in China.

Numerous Buddhist missionaries such as Kumarajiva, Sangabhuti, Gyanabhadra, and others went to China. Simultaneously, Chinese pilgrims like Fa-Hien, Hiuen-Tsang, and I-tsing visited India.

Sanghabhuti is known for authoring a commentary on the Sarvastivada Vinaya.

Therefore, the correct answer is (c).