How Did King Feel About the Vietnam War After 1966

How did King feel about the Vietnam War after 1966?

A) He became more supportive of the war as the United States began defeating the communists there.
B) He never made a public statement about the war.
C) He was increasingly critical of the war as well as the idea that blacks should fight for a country that wouldn't guarantee or protect their civil rights.
D) He vacillated constantly over the war and never really came to a firm position before his death.