Which statement best describes how machine guns were used during world war 1?

Answer choices are :

A. to attack tanks

B. to defend against mustard gas

C. to attack aircraft  

D. to defend territory

Correct answer choice is :

Machine guns could shoot hundreds of shots of ammo a minute and the standard military tactic of World War One was the army charge. Casualties were enormous. Many soldiers hardly got out of their trench before they were marked down. During that war, they forced a move to trench battle. In later wars, they supported change armies' tactics, moving the armies away from massed formations and into unsecured battle orders.

answer: a tolerated diverse population

explanation: the city of baghdad formed to vast semi- circles on the right and left banks of the tigris twelve miles in a diameter.