Describe at least three reasons why it was so difficult for soldiers to attack enemy trenches

This was because there was no protection for the troops. As a result, trenches were dug at angles or with curves in them (such as around mounds of earth). This meant that pieces of shell or bullets could not pass through obstacles such as earth and sandbags.

Trench life involved long periods of boredom mixed with brief periods of terror. The threat of death kept soldiers constantly on edge, while poor living conditions and a lack of sleep wore away at their health and stamina.

Trenches were long, narrow ditches dug into the ground where soldiers lived. They were very muddy, uncomfortable and the toilets overflowed. These conditions caused some soldiers to develop medical problems such as trench foot. ... In the middle was no man's land, which soldiers crossed to attack the other side.

Explanation:

d. it adversely affected american productivity

i would say your answer is a)

sorry if im wrong