Members of the military may need to engage in behaviors, such as killing or wounding the enemy, that may go against personal moral standards such as "thou shalt not kill." to get people to adhere to group rather than individual standards, the military acts to increase soldiers' sense of when they are on the battlefield.

The correct answer is deindividuation.

Deindividuation refers to the phenomenon in which members of a group lose their sense of personal-identity and self-awareness when working in a group. Group members become less individualized and more anonymous when they are part of a group. This in turn leads to individuals performing certain actions or behaving in a way that they would not normally behave in when alone as opposed to when they are part of a group. 

C. is the answer ur welcome