(Sorry that this is late)
There are many versions of this question; however, hopefully the version I got can help as many people as possible. (I am so sorry if you don't have the same version; I wish you all luck.)
For those who have this version, these are the correct answers according to the exam:
Correct use of colon:
- For tomorrow's campout, please bring the following items: sleeping bags, tents, food, and firewood.
- The astronauts saw the details of the moon: craters, valleys, and a barren landscape.
Incorrect use of colon:
- My favorite books are: Les Misérables, Great Expectations, and War and Peace.
- We need: lightbulbs, dish liquid, and paper towels.