According to the process of isostatic adjustment,
a. thin sections of crustal material float higher than thicker slabs.
b. crustal slabs adjust very rarely.
c. thick sections of crustal material float higher than thinner slabs.
d. mountains are lowered as they become older.

The correct answer is C. thick sections of crustal material float higher than thinner slabs.

Explanation:

It is known that on the ocean floor are deposited most of the materials that are will be carried by different streams of water. The weight that is added to the area causes the ocean floor to sink by isostatic adjustment and there is a process called subsidence.