Which of the following sentences are the pronoun and antecedent not in agreement?
a. if the oven is turned on now, he will have time to preheat.
b. many times the sky opened up and it rained
c. robert was tired because he stayed up too late at night
d. they did not know when they would see each other again

cassius, casca, and their allies plant false documents to manipulate brutus to join their cause to remove caesar. after doing so, they visit brutus at night in his home to persuade him of their views. there they plan caesar's death. brutus is troubled but refuses to confide in his devoted wife, portia. on 15 march, caesar's wife, calpurnia, urges him not to go to the senate. she has had visionary dreams and fears the portents of the overnight storms.