Which sentences use a colon correctly?

choose all answers that are correct.

a.
these books are for: ralph, jessica, and craig.

b.
whales primarily consume four sources of food: shrimp, larvae, plankton, and krill.

c.
her favorite colors are: green, blue, and purple.

d.
our bus will stop in these cities: knoxville, atlanta, and tallahassee.

e.
pack the following: a sleeping bag, a change of clothes, and a flashlight.