The correct answer is B. Hinduism
Step-by-step explanation:
The Khmer Empire was an empire that developed in Southeast Asia during the 9th century and that covered the modern territories of Cambodia and part of China and Vietnam. This empire has been recognized for his art and architectural structures including multiple temples and monuments. Additionally, in terms of religion, the Khmer Empire was considered as a Hindu-Buddist empire as both of these religions were practiced in the territory. Indeed the official religions included two types of Buddhism that were Mahayana Buddhism and Theravada Buddhism and Hinduism, religions that also had an influence on the practices of people and the temples built. Therefore, in addition to Buddhism, the people of the Khmer Empire practiced Hinduism.