Khmer, often known as Cambodian or Kampuchean lived in Cambodia, Thailand, and Vietnam.
Who are the Khmer people?
Khmer, often known as Cambodian or Kampuchean, is an ethnolinguistic group that makes up the majority of Cambodia's population. Southeastern Thailand and the Mekong River delta in southern Vietnam have smaller populations of Khmer.
Cambodia, Thailand, and Vietnam were the place of residence for the Khmer people.
Therefore option D aptly describes the Khmer people.
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