Which choice shows the proper way to use a colon?

Many people take ski trips and skiing is: a great hobby.

I have one problem with the ski trip this weekend: I can’t ski!

I am not a: good skier I like to go bowling.

Some people are good skiers: but others are not.

Some people are good skiers: but others are not.

The proper way to use a colon is shown in the following sentence: "I have one problem with the ski trip this weekend: I can’t ski!"