Which social psychology theory states that we need to have our attitudes and behavior in alignment?

The correct answer is the cognitive dissonance theory.

According to the cognitive dissonance (CD) theory, when our attitudes and beliefs contradict our behavior, we face discomfort and uneasiness. This in turn, leads us to alter either our beliefs or behaviors in order to restore balance and resolve the discomfort we experience when our attitudes and behavior is not in alignment. 

There were celebrations in Europe after Germany surrendered.

But on the other side of the world in the Pacific Ocean, Japan was still fighting against America, Britain and their allies.

The Americans, however, had a secret plan to end the war - by using the most powerful weapon ever created.

Answer C.