How did trench warfare change the nature of fighting during World War I? A.
Armies had to abandon the use of heavy artillery.
B.
Paratroopers were used to get behind enemy lines.
C.
Troops were forced into defensive positions leading to a stalemate.
D.
Civilians were forced to engage in military activities that increased casualties.

The answer is C

Explanation:

Trench Warfare was adopted on the western front by both sides in late 1914. Trench Warfare consists of soldiers digging long, interconnected streches of trench systems, which would be fought over by charging thousands of soldiers from the opposite trench at the enemy to overwhelm their defences.

answer; ///i do believe that the correct answer is (b) ///middle colony