He said to me, " I had to finish this first."

A He told me that he has to finish this first.

B He told me that he have to finish this first.

C He told me that he had had to finish this first.

D He told me that he had to finish this first.

Correct Answer: Option C

When Reporting verb in past Tense and reported speech is having "had to" after subject + First Verb.

Then we change "had to" to "had had to" + First verb.