What supply problems did the allies face in europe during world war ii?
road and rail routes had been destroyed by the war, so it was hard to transport supplies to their troops.
supplies had to travel a long way overland through harsh weather, so they often did not reach the troops that needed
them.
most supplies were manufactured in the united states, so sabotage by antiwar groups there was common
supplies had to travel a long distance across water on ships that were often attacked, so they did not reach europe.

Supplies had to travel a long distance across water on ships that were often attacked, so they did not reach Europe. (Answer D)

Explanation:

A lot of supplies were imported from western countries to Europe, specifically the United States supplied the allies with weaponry, food, basic necessities, etc. Because of this, ships were often attacked by the Axis so a lot of ships could not make it to Allied ports.

Supplies had to travel a long distance across water on ships that were often attacked, so they did not reach Europe.

i would go with the last one