!!PLEASE ANSWER ASAP!!

which of the following best explains the economic reason for industrialized nations building empires in the late 19th and early 20th centuries?

a. they needed colonies for their growing populations.

b. they want to spread christianity throughout the world.

c. they required more natural resources to produce goods, and new markets in which to sell goods.

d. they wanted to create conflict and make war with smaller countries.