Question

u-boats were used primarily to
○ gather information about enemy movements by tracking warships.
○ protect the german coast from attack by allied ships and submarines.
○ resupply troops with guns, ammunition, and food via sea rather than land.
○ target allied shipments on passenger ships, warships, and merchant ships.

Explanation:

U - boats (German submarines) in World War I and II were mainly used for attacking Allied shipping. They targeted passenger, war, and merchant ships carrying supplies to disrupt Allied logistics. The first option is incorrect as their main role wasn't intelligence - gathering via tracking. The second option is wrong as they were offensive, not just coastal defense. The third option is incorrect as they didn't resupply troops; they attacked.

Answer:

D. target Allied shipments on passenger ships, warships, and merchant ships.