Answer:
Correct answer is Khmers.
Step-by-step explanation:
Samurai is not correct answer as this were the members of Japanese military class, similar to European knights.
Bushi is also not correct answer as this is a synonym for samurai.
Shoguns were military leaders in Japan, so therefore this answer is also false.
Therefore D is the correct answer. Today most of the Khmers are living on Cambodia.