Directions: In each of the questions below, three sentences are given that may or may not contain an error. Choose the one that is grammatically as well as contextually correct and meaningful. If all the sentences are correct, mark 'All are correct' as your answer.

A) The artist, along with his assistants, were preparing for the exhibition.

B) The book that you gave me was really interesting.

C) Unless he doesn’t apologize, she won’t forgive him.