Question

what does tritons orbit suggest about its past?
it was actually much hotter in temperature in the past, and its temperature shift altered its orbit.
it used to be a planet that became a moon when it collided with an asteroid.
it may have been an independent body that was somehow pulled into neptunes orbit.
it used to orbit in an elliptical shape and likely transitioned to a circular orbit after the \great dark spot\ disappeared.

Explanation:

Triton has a retrograde orbit (opposite to Neptune’s rotation), which is unusual for large moons. This suggests it was not formed with Neptune but captured from elsewhere. The correct option aligns with this capture hypothesis.

Answer:

It may have been an independent body that was somehow pulled into Neptune’s orbit.