What is the meaning of crust, plate and mental

Explaination:

Crust:-

The Crust is the out of the Earth. It varies in the thickness from 5 to 60 km. It is thin under the ocean and can be as in as 5 kilometre. Under the continents, it can be as thick as 40 kilometre the Earth's crust is rigid and is broken into pieces called plates these plates are constantly moving, forming different kinds of landforms.

The Mantle:

In Above Picture

d is the logical answer but im not a 100% sure