How does the sonnet structure contribute to the meaning of the poem? A) It does not have any effect on the poem
B) It sets up an idea at the beginning and expands it with similes before extending it in the last two lines
C) It sets up a humorous situation in the first part, then changed to a more serious one with the couplet at the end
D) It sets up a contrast at the start and then develops it to greater and greater lengths before reversing it with the couplet at the end