Which major event led to the division of the Korean peninsula at the 38th Parallel?

A.
The war between North Korean democratic forces and the communist Viet Cong.
B.
The war between North Korean democratic forces and communist forces from China.
C.
Japan being stripped of all its colonies upon surrendering in World War II.
D.
Germany being stripped of all its colonies upon surrendering in World War II.

C. Japan being stripped of all its colonies upon surrendering in World War II.