What benefit were colonies supposed to have for the nations who had them?

The nations who either had or wanted to have colonies in the New World or Africa wanted these colonies to bring them a massive amount of natural resources and riches, such as cotton, tobacco, gold, silver, etc--which were wildly profitable. 

The correct answer is A: Yugoslavia was dissolved: right now it's only left in the name of Macedonia (Former Yugoslav Republic of Macedonia): there is no other other country with that name. The country split into smaller republics which are all independent today.