What does Triton's orbit suggest about its past?

(1 point)
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 Neptune's orbit.
It used to orbit in an elliptical shape and likely transitioned to a circular orbit after the "Great Dark Spot" disappeared.

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