Final answer:
Leucosomes are rich in light-colored minerals, particularly quartz. They are a feature of migmatites formed through partial melting during metamorphism. Option e is correct.
Step-by-step explanation:
The leucosome, which is a component of a metamorphic rock known as migmatite, is rich in light-colored minerals. The correct answer to which minerals the leucosome is rich in is e. quartz, which is one of the primary components of a leucosome.
Along with quartz, leucosomes can also be rich in other light-colored minerals such as feldspar and muscovite, but these are not options provided in the question. Leucosomes are formed through partial melting of rocks during metamorphism, where the lighter minerals tend to segregate into these bands. The answer provided here reflects a common mineralogical composition found in leucosomes.