The image shows a sample of the metamorphic rock called gneiss. Why does this particular rock have bands?



A.
Flowing water elongated the layers of the rock during cementation.
B.
Migration and growth of organisms within the magma caused stretching.
C.
Long, narrow cavities and voids in the rock filled with a variety of minerals.
D.
Minerals in the rock stretched under the pressure of Earth’s moving plates.