Question

neptunes rings were most likely formed by:
collisions between moons.
gravity between its moons.
excess debris from the surface
windstorms in the upper atmosphere

Explanation:

Neptune's rings are faint and composed of small particles. The leading theory is that they formed from debris created by collisions between Neptune's moons or between moons and smaller objects (like asteroids/comets). Gravity alone doesn't produce ring material; surface debris and upper atmosphere windstorms can't generate the widespread, stable ring structure observed.

Answer:

collisions between moons