What Prompted Congress to Pass the Gulf of Tonkin Resolution

What prompted Congress to pass the Gulf of Tonkin Resolution?

A) a North Vietnamese attack on an American airbase at Pleiku
B) the movement of Chinese troops on the border between China and North Korea
C) evidence that the Soviets were supplying the North Vietnamese with aircrafts and weaponry
D) false reports that the North Vietnamese had fired on two American naval ships
E) the overthrow of the Communist government in North Vietnam