Why did Sompop begin researching social problems among hill tribe people?
A.
Because he specialized in sociology and hill tribe people made an interesting topic for research.
B.
Because he needed to write a paper on the life of the hill tribe people for his bachelor's degree.
C.
Because the hill tribe people asked him for help to stop their daughters from going to the city.
D.
Because he realized how serious the problem of prostitution had been among young girls in the hill tribe.