Question

quartzite is a rock that can form at the boundaries of tectonic plates. over time, sandstone buried at the boundary is folded and changed by pressure and heat. the sandstone becomes quartzite. quartzite is most likely a(n)
choose one option
a igneous
b sedimentary
c metamorphic

Explanation:

Metamorphic rocks form when existing rocks (like sandstone here) are changed by heat and pressure. Igneous rocks form from magma/lava. Sedimentary rocks form from sediment accumulation. Since sandstone (a sedimentary rock) becomes quartzite due to heat and pressure, it fits metamorphic rock formation.

Answer:

C. metamorphic