Question

what landform forms at convergent ocean plate boundaries?
a ridges
b trenches
c valleys
d mountains

Explanation:

Convergent ocean plate boundaries occur when two oceanic tectonic plates collide. The denser plate subducts beneath the less dense one, creating a deep, narrow depression on the ocean floor. Ridges form at divergent ocean boundaries, valleys are typically continental features, and mountains form at convergent continental-oceanic or continental-continental boundaries.

Answer:

B. trenches