Final answer:
Granite is the correct answer to the student's question as it is the light, large-crystalled igneous rock that predominately composes the continental crust.
Step-by-step explanation:
The light, large-crystalled igneous rock that makes up most of the continental crust is granite (Option B). Granite is less dense than the mafic rocks such as basalt that make up the oceanic crust. Due to its low density and thick composition, continental crust rises higher on the mantle, contrasting with oceanic crust that forms basins when submerged in water, becoming the planet's oceans. Granite is a type of coarse-grained, intrusive igneous rock, typically comprising minerals like quartz, feldspars, and biotite or amphibole, and it forms when magma cools slowly beneath the Earth's surface, creating large crystals.