What Is the Prediction for the Future of Triton

Multiple Choice

What is the prediction for the future of Triton?

A) It will provide the raw material for a future Neptunian ring.
B) It will develop active volcanoes as Neptune's tidal stresses become greater.
C) It will crash into Nereid when the smaller moon comes too close.
D) Its orbit, while retrograde, is very stable and will not change.
E) Its retrograde orbit will throw it back out into the Kuiper Belt again, with Pluto.