Answer:
The takeover of South Vietnam by the communist North was completed on April 30, 1975, two years after the United States signed a peace treaty with Hanoi and pulled out its combat troops after a decade-long struggle. This gave the responsibility for the war to the South Vietnamese
Explanation:
Pretty sure it is C because it it divisible by 3. If you divide 15 you get 5 and if you divide 6 you get 2.
