Groups of soldiers are called:

A group of soldiers are called troops.

Explanation:

Troops are soldiers, especially when they are in a large organized group doing a particular task. The operation will involve more than 35,000 troops from a dozen countries. There were reports of troop movements. A troop is a group of soldiers within a cavalry or armoured regiment.

Battalions

Explanation:

what are the answer choices?

taking a bath requires the most water out of the given options because it takes a significant amount of water in order to fill a bathtub.