Which statement best summarizes the impact of machine guns and artillery?

a) Machine guns played a more important role in World War I than artillery did.

b) Improvements in artillery made machine guns obsolete.

c) Both machine guns and artillery contributed to a defensive war.

It would be letter c) Both machine guns and artillery contributed to a defensive war. During the great war or other conflicts that used these weapons it enhances the defensive capabilities of the force that wields it. It also become a significant weapon during the First World War and force the two alliances bogged down in the trench warfare.