Which of the following sentences uses semicolons correctly?
chris and molly were delighted to see the whole family gathered in the living room; the group was waiting to congratulate the couple.
chris and molly loved spending their weekends at the beach during the summer; where they met some of their friends occasionally.
molly wasn't expecting chris to stay up working so late; she could hear her favorite song playing on the radio.
while chris was preparing molly's favorite meal; she decided to take out the trash, repair the broken shelf, and water the plants.

A) Chris and Molly were delighted to see the whole family gathered in the living room; the group was waiting to congratulate the couple.

Explanation: One of the most common uses of a semicolon is to join two independent clauses without using a conjunction like "and." This two independent clauses must be closely related between them (usually one of them gives an explanation for the other one). From the given options, the sentences that uses semicolons correctly is the corresponding to option A, because it is used to join the independent clauses "Chris and Molly were delighted to see the whole family gathered in the living room" and "the group was waiting to congratulate the couple."

b is the answer for this question.