Which sentence uses the colon correctly? kelly was very excited: about the rock concert her friend won tickets for on the radio. she spent four days trying to put together the perfect outfit. in the end, she settled for something simple: a black tee, ripped jeans, and a headband. in contrast to kelly: her friend, maria was dressed rather flamboyantly. she wore shocking pink slacks with a silver tank top. all eyes were on: both the girls that night.

The correct answer is B. She spent four days trying to put together the perfect outfit in the end, she settled for something simple: a black tee, ripped jeans, and a headband.

Explanation:

Colon (:) is a punctuation sign just as a comma (,) or a question marks (?),  this punctuation sign is usually used before a list of items that are related to the previous sentence, but colon can also be found as a sign to introduce an explanation, a quotation or an example. In this case this sentence contains a list of items "a black tee, ripped jeans, and a headband" that are related to the previous sentence "she settled for something simple", considering this the use of colon (:) to introduce the list of items is grammatically correct and this is the only sentence that uses colon according to grammar rules that set colon should be used to precede a list, example, quotation or explanation.

"the day we found the sharks' teeth" i would say highlight the element of the plot as it sets its boundaries and centers the adventures of them being on a boat and cleaning spit of sand.