Question

To expand their empires, imperialist countries in the 1800s preferred to take over
other imperialist countries with experienced labor forces.
industrially undeveloped countries rich in natural resources.
other imperialist countries that needed raw materials.
industrially undeveloped countries that needed resources.

Answer 1

industrially undeveloped countries rich in natural resources.

Explanation: 19th-century imperial powers sought colonies that provided raw materials for their factories (and new markets), so they targeted weaker, industrially undeveloped regions that were rich in natural resources.