People Might Work More During a War Time Temporary Increase

People might work more during a war time temporary increase in government purchases because of:

A) a military draft or voluntary enlistment takes away some primary household earners and to maintain consumption as the model predicts, those households may have other members work who did not previously.
B) the increase in the MPL leading to an increase in the demand for labour and increased capital utilization as the model predicts.
C) increased investment leading to hire capital stocks that increase the demand for labour as the model predicts.
D) all of the above.