Question

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

A. to show that separate ideas are related
B. to show that an action has ended
C. to indicate that a question is being asked
D. to show that the second part of the sentence is an example of the first

answer: D (apex)

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...