I will not fail: 'tis twenty years till then.

I have forgot why I did call thee back.

Which is a clue that these lines are in blank verse?

A. These lines do not have rhythm.

B. These lines show irony.

C. These lines are in the first person.

D. These lines do not rhyme.

The right answer for the question that is being asked and shown above is that: "C. These lines are in the first person." A clue that these lines are in blank verse is that these lines are in the first person. I will not fail: 'tis twenty years till then. I have forgot why I did call thee back.