Which of the following turn world war i into a global war?
a. the machine gun
c. the submarine
b. the airplane
d. poison gas

C. The submarine helped turn World War I into a global war. They are offensive stealth weapons, and made it easy to attack ships without being seen.

In 20,000 Leagues under the Sea, the men make the important decision to escape the Nautilus. This decision results in the climax of the story. The building action finally results in a drastic decision that causes major changes, which eventually lead to falling action and resolution.