Which of the sentences is the best choice for the reported speech?
He said, "Will you help me with this essay please? I have to hand it in tomorrow.
a. He told me to help him with that essay as he would have to hand it in the next day.
b. He asked if I would help him with that essay as he would have to hand it in the tomorrow.
c. He asked me to help him with that essay as he had to hand it in the next day.
d. He asked me to help him with that essay as he had to hand it in tomorrow.