Final answer:
The best reflecting statement is (D), portraying the mountain as vibrant and full of energy, as indicated by its readiness and the metaphor of preparing to sing.
Step-by-step explanation:
The statement that best reflects the meaning of the lines: "Oh, but here I am, here I am, here, I remain high on each and every peak,/carefully rumbling her great underbelly, prepared to pour forth singing?" is (D) The speaker is a mountain that is full of life and energy. This interpretation combines the imagery of being "high on each and every peak" with the action of being "prepared to pour forth singing," suggesting a presence that is vibrant and energetic. The metaphorical language gives the mountain anthropomorphic qualities, expressing a readiness and potential to exude a powerful force, much like life itself.