Which sentence uses a colon correctly?

after buying groceries, we unloaded: the canned food, fresh vegetables, milk, and ice cream.

reed sent his application for camp to: soccer for all, 20 market street, denver, co.

projects may be dropped off at the following locations: room 16, room 78, or room 3.

patrick received letters of congratulations from: aunt julie, grandma, and his friend william.

However, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. what would be the best way to revise this sentence for greater clarity? a) however, the fact that columbus left spain thousands of years after people settled what would become the united states never dawned on me. b) it never dawned on me, however, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain. c) however, the fact that people were already living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. d) however, the idea never dawned on me that long before columbus ever left spain, real-life people lived for thousands of years in what would become the united states.