Choose the sentence that correctly uses the third conditional.

a) If she studies harder, she will pass the exam tomorrow.

b) If you heat ice, it melts.

c) If they go to Paris, they visit the Eiffel Tower.

d) Unless it rains, we cannot cancel the picnic.

e) If he had known your number, he would have called you.

Responda: Choose the sentence that correctly uses the third conditional.