Final answer:
Granite and rhyolite are classified into two different groups due to differences in mineral composition, specifically in terms of their origin and formation.
Step-by-step explanation:
Granite and rhyolite are both igneous rocks, but they are classified into two different groups due to differences in mineral composition. While both rocks contain feldspar, quartz, and mica crystals, the proportions and arrangement of these minerals differ between granite and rhyolite. Granite has a coarse-grained texture, with larger mineral grains, while rhyolite has a fine-grained texture, with smaller mineral grains.
This difference in the mineral composition and texture of the rocks can be attributed to differences in origin and formation. Granite forms from slow cooling magma deep within the Earth's crust, whereas rhyolite forms from the rapid cooling of lava on the surface.
Therefore, the correct answer is B) Differences in origin and formation.