Concept:High temperature and pressure cause metamorphism, which changes the structure of existing rocks.
Explanation:Sandstone is a sedimentary rock formed from compressed sand and quartz grains.
Under high temperature and pressure, these sand grains recrystallise and bind tightly together.
This process transforms the soft sedimentary rock into a much harder metamorphic rock.
The resulting rock is rich in quartz and is known as quartzite.
Basalt, coal, and limestone do not form this way from sandstone.
Basalt is an igneous rock, coal is an organic sedimentary rock, and limestone is a carbonate sedimentary rock.
Therefore, quartzite is the correct product of sandstone metamorphism.
Answer:B. quartzite