Question

A colon may be used in which of the following situations?

Answer 1

I believe the answer is D:

A lot of people use colons when making lists. 
For Example, look at the sentence below- 

I only need to buy 5 things from the store: Apples, Bananas, Cereal, Toothpaste, and Soup. 

The items they've listed are related to the sentence that comes before the items...

Answer 2

The correct answer would be d