Question

what geological process is most likely to occur at a divergent plate boundary under the ocean? formation of underwater mountains formation of ocean trenches creation of mid - ocean ridges subduction of plates

Explanation:

At divergent plate boundaries, tectonic plates move apart. In the ocean, magma rises to fill the gap. This magma cools and solidifies, creating new oceanic crust. Mid - ocean ridges are formed by this continuous process of magma upwelling and crust formation.
Underwater mountains can form in various ways (e.g., volcanic activity not necessarily at divergent boundaries). Ocean trenches and subduction of plates occur at convergent boundaries (where plates move towards each other).

Answer:

Creation of mid - ocean ridges