What causes slab pull in Earths crust?

a. the movement of salt water near deep ocean beds.

b. thick portions of earths crust colliding with thinner portions

c. convection currents within earths molten mantle

d. solar winds moving charges particles into Earths atmosphere

The correct answer is option c. "convection currents within earths molten mantle".

Explanation:

Slab pull in Earth's crust happens when a dense oceanic plate is plunged into the mantle as a result of convection currents within the molten mantle. This happens because the oceanic plate is denser than the hotter mantle beneath it, which results in the formation of convection currents and a pulling force exerted by a the cold and dense oceanic plate.

I wanna say b or c. Im not to sure