Question

what is the primary outcome of oceanic-oceanic convergence?
creation of deep oceanic trenches
formation of mountain ranges
expansion of continental landmasses

Explanation:

Oceanic - oceanic convergence occurs when two oceanic plates collide. The denser plate subducts (goes under) the less dense one. This subduction process creates deep oceanic trenches. Mountain ranges are typically formed by continental - continental convergence, and expansion of continental landmasses is not a result of oceanic - oceanic convergence.

Answer:

A. creation of deep oceanic trenches