The correct answer is D: Innisfree is more calm and peaceful.
In this poem, Yeats describes an actual island which was uninhabited. As such, it was a place of peace and quiet -- therefore any answer which describes Innisfree as chaotic, busy, or complex (Answers A through C) can be eliminated.
Answer D is the only one that remains, and for good reason: this excerpt makes clear that Innisfree is a place of peace. Therefore Answer D is the correct answer.