Answer:
The statement is true. The people of the prosperous Khmer Empire practiced both Buddhism and Hinduism.
Explanation:
The Khmer Empire was born professing the Hindu religion and for that reason all the cosmology, the architecture, the customs and the conception of the sacred things were widely reflected in this religion, although it was not accepted to the caste concept, but to the brahmanism.
While the Empire was founded under the aegis of Hinduism and would continue to be present in culture until contemporary times, the Khmer Empire would soon see a new religion arrive, this time from Sri Lanka, the Theravada Buddhism during the thirteenth century. King Jayavarman VII was captivated by the teachings that were transmitted to him by the visiting monks of that country about the Buddha. Little by little all the subjects would follow him, but the Hindu elements would never disappear, creating a particular religious syncretism. During the reign of Jayavarman VIII at the end of the thirteenth century there was a brief reimplantation of the Hindu cult as a state religion.