Aportion of a plate with continental crust composing its uppermost layer is thicker than one bearing crust

A portion of a plate with continental crust composing its uppermost layer is thicker than one bearing Oceanic crust

Explanation:

The continental crust which is the uppermost layer of the lithospheric plate is thicker and less dense than the oceanic crust because of the constituent that makes up the crust. The continental crust is mainly compose of  granitic rocks.

The oceanic crust are more dense and thinner than the continental crust . The  oceanic crust is mainly composed of Mafic rocks like the basaltic rocks . And the high density nature of the oceanic crust contribute to it less active nature if it collides with the continental crust . when it collides with the continental crust it tends to subduct.

The oceanic crust has a thickness of about 70 km  while the thickness of the continental crust ranges from 125 km to 250 km . Rocks found in the continental crust are usually more older than the rocks found in the oceanic crust because in the oceanic crust newer crust are been formed around the oceanic ridges while the older rocks are subducted in trenches.  

the answer is b. hope this !