An increase in military spending is most likely caused by

A. a terrorist attack overseas.

B. a terrorist attack at home.

C. a threat to national security.

D. a war or multiple wars.

An increase in military spending is most likely caused by D. a war or multiple wars. I agree with the answer given below. Military spending grows very high because of the war investment. It's a heavy period for every contry as it causes meny problems except high military spending. Other options also cause high military spending but not so high as D.

An increase in military spending is most likely caused by a war or multiple wars. Military spending is a budget that is allotted by a government to support and supply of the warfare especially when there is a war. They have this budget so that they can keep up with the demand on their defensive activities during the war.