During World Wars, the zigzag pattern of trenches on the front lines was designed to
provide a place from which to fire on the enemy.
supply soldiers with a place to store weapons.
protect troops from enemy fire.
Oshield machine guns from enemy attack.

C-   During world war 1, the zigzag pattern of trenches on the front lines was designed to protect troops from enemy fire. The trenches were dug in a zigzag pattern instead of the usual straight pattern.

Explanation:

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first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.