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

The sentence in which the pronoun and antecedent are not in agreement is A. If the oven is turned on now, he will have time to preheat.
The pronoun he is incorrect - it should be it. 

Elpenor, Anticlea, and Tiresias

Explanation:

Odysseus enters the world of the dead and his companions are on the surface performing rituals to calm the dead. There he meets three ghosts, the first is his friend Elpenor, who was able to get Odysseus back to the island of Circe and give him a good burial

The second ghost Odisse encounters is the ghost of his mother, Anticlea, who asks him how he was able to reach the underworld and if he has already approached Ithaca. Odysseus replied that he had to go to the Underworld to consult Tiresias and that he had not yet reached Ithaca. Odysseus' mother says that Penelope remains faithful in her heart to Odysseus. And that the father still lives but he is very weak.

Finally, Odysseus finds the ghost of Tiresias, who speaks the following prophecies:

Poseidon will try everything so that Odysseus does not return home When Odysseus comes home, great concerns will come because there will be men who claim to own his wife and these men are destroying the property of Odysseus. Odysseus will kill these men. Odysseus will end up in an opulent old age and that in his return the peoples will flourish.