In which of the following sentences are the pronoun and antecedent not in agreement?

ever since they were little, the soccer players played the game.

a student should keep her password a secret.

they themselves to some mashed potatoes.

your mother always tells you to wash your hands before dinner.

Which choice is a major detail from paragraph two? a) the great wall is a large network of several walls and towers. b) the great wall looks like a long wall snaking its way across china. c) the great wall was constructed over hundreds of years beginning in 221 b. c. d) the great wall construction encouraged several independent kingdoms to unite.