Read these lines from shakespeare's sonnet 130.

"i love to hear her speak, yet well i know/that music hath a far more pleasing /and yet, by heaven, i think my love as rare/as any she belied with false compare."

why does shakespeare structure the sonnet's final two lines differently than the rest of the sonnet?

a. to force the reader to interpret the conclusion's meaning
b. to lend impact to the sonnet's conclusion
c. to add a note of despair to the sonnet's conclusion
d. to force the reader to ponder the futility or words