Answer:
Option: B: They provided retreats for monks and temples for travelers to worship.
Step-by-step explanation:
The Buddhist cave temples along the Silk Road built as religious shrines and retreats and temples for monks and travellers. Dunhuang bore as an observer to commercial, cultural exchange and religion along the trade routes linking the East and West from 4th to 14th century. The Buddhist caves came to be known as the Magao Caves. These caves built during the Tang Dynasty in the southeast of the centre of Dunhuang. Dunhuang was a religious and cultural crossroads on the Silk Road. The Mogao caves consist of 492 temples with Buddha sculptures along with painting on the wall and ceiling.