Which poetic line contains both paradox and consonance?

Question

A. One summer day, all day I drove it hard
B. How long it might last, how young it might be
C. Ay, look, and he'll smile thy gloom away
D. At least to know the worst is

I'm leaning towards c. being the right answer

Answer 1

however; they all seem to have consonance and i could find a possible paradox in a,b, and c.

Answer 2

http://en.wikipedia.org/wiki/Literary_consonance

http://en.wikipedia.org/wiki/Paradox

Read the definitions and examples carefully. Then re-think your choice.