Which of the following is true about trenches on the frontlines in World War I?

A) They surrounded all of Germany.
B) They could get incredibly dusty.
C) They ran in straight, monotonous lines.
D) They were often polluted with sewage and corpses.

Trenches

Long, narrow ditches dug into the earth used in warfare as a defensive tactic to protect soldiers from enemy fire.

Frontlines

The most advanced, crucial, or intense area of a conflict or situation where opposing forces meet, often used in a military context.