Which poetic line contains both paradox and consonance?

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 sweet

A paradox is a literary device that uses two opposing thoughts which may appear senseless, but turns out that it contains a kind of truth in it. A consonance is also a literary device by the repetition of consonant sounds within sentences, phrases or poems. From the given question above, the line that contains both paradox and consonance is option D: At least to know the worst is sweet.