It is B because the other answers can’t be it
In several words, listening to any specific genre of music will not affect your intelligence. Sometimes one's intelligence will influence what kind of music they listen to, but that's about where the correlation ends, and it still differs from person to person. Try rap music.
The correct answer is D. There is a change in mood from the quatrains to the final couplet. This is common in the English sonnet that the final couplet is used to change the mood and add new meaning to what was previously said, thus being a sort of a peak for the sonnet.
