The correct answer is A. Sandstone.
Sandstone is a sedimentary rock composed of sand-sized grains of mineral, rock, or organic material. The grains of sand are cemented together by silica, iron oxide, or calcium carbonate. Sandstone is a common rock type and is found in many different parts of the world.
When sandstone is subjected to heat and pressure, it can change into quartzite. Quartzite is a metamorphic rock that is composed of quartz. Quartzite is very hard and durable, and it is often used in construction.
Limestone is a sedimentary rock composed of calcium carbonate. Limestone is formed when the remains of marine organisms, such as coral and algae, accumulate on the seafloor. Over time, these remains are buried and compacted, and they eventually turn into limestone.
Shale is a sedimentary rock composed of clay minerals. Shale is formed when clay particles are deposited in water and then compacted. Shale is a very common rock type and is found in many different parts of the world.
Gypsum is a sedimentary rock composed of calcium sulfate. Gypsum is formed when seawater evaporates, leaving behind calcium sulfate crystals. Gypsum is a soft rock that is often used in construction.
In conclusion, the correct answer is A. Sandstone. Sandstone is a sedimentary rock that can change into quartzite by metamorphic action.