Question

where do plates sink back into the mantle?
convective zones
mid - ocean ridge
slab pull
subduction zones

Explanation:

In plate - tectonics, subduction zones are the regions where one tectonic plate moves under another and sinks back into the mantle. Convective zones are related to heat transfer in the mantle but not the specific location of plate sinking. Mid - ocean ridges are areas of plate divergence. Slab pull is a force that contributes to plate motion, not a location.

Answer:

D. subduction zones