In Which of These Situations Is a Soldier Going to Be

In which of these situations is a soldier going to be most willing to kill enemy combatants or civilians?

A) when they are alone in the same room with the enemy
B) when they are trying to make their own decision whether to detonate a set of explosives that will kill enemies in another town
C) when they are in a plane over an enemy target and their superior is commanding them to drop a bomb
D) when they are being ordered to execute an enemy figure who is standing in front of them