The correct answer is A) it became Communist.
The other options of the question were B) it became a puppet government. C) it became democratic. D) it became French controlled.
After the fall of the Khmer Rouge, the government of Cambodia became Communist.
The story of Cambodia after the Vietnam War continued to be conflictive. Things got worse with the Khmer Rouge movement led by cruel leader Polt Pot got to power after Communist Vietnamese were expelled from Cambodia as well as the pro-US government in 1975. Pot controlled the capital city of Cambodia -Phnom Penh- and for five years, he established the Kampuchean People's Republic. Then, on January 7, 1979,
the Vietnamese soldiers capture Phnom Penh, and a Communist government was reestablished.