Sam wrote this expression to describe the number of apples he gave away to his friends. 12 – a which situation could be described by this expression? a. sam does not know how many apples he has. he knows he gave away 12 apples. b. sam knows he has 12 apples left. he does not know how many apples he gave away. c. sam knows he has 12 apples left. he gave away half of his apples. d. sam knows he had 12 apples to start. he does not know how many apples he gave away.