Question

what is shown in this illustration?
oceanic - oceanic convergence boundary
continental - continental convergence boundary
transform boundary
divergent boundary

Explanation:

The illustration shows one oceanic plate subducting beneath another, with magma rising to form a volcanic structure above—this is the defining feature of an oceanic-oceanic convergence boundary. Continental-continental convergence does not involve subduction (both plates are buoyant), transform boundaries involve lateral sliding, and divergent boundaries involve plates moving apart.

Answer:

oceanic-oceanic convergence boundary