what is a true statement about a shakespearean sonnet

a: the final couplet reverses the ideas of the three quatrains

b: the third quatrain shows a reversal of thought from the first two quatrains

the third quatrain shows a change in mood fro the first two quatrains

c: the third quatrain shows a change in mood from the first two quatrains

d: the final couplet states the main idea of the poem