The correct answer is: a) Granite.
Granite is a hard, igneous rock composed of quartz, feldspar, and mica. It is one of the most common building stones in the world, and is particularly famous in Gujarat. Granite is quarried in several districts of Gujarat, including Kutch, Jamnagar, and Rajkot. It is used for a variety of purposes, including building construction, monuments, and sculptures.
Sandstone is a sedimentary rock composed of sand-sized grains of mineral, rock, or organic material. It is less common than granite, but is still quarried in some parts of Gujarat. Sandstone is used for a variety of purposes, including building construction, landscaping, and sculpture.
Marble is a metamorphic rock composed of limestone that has been subjected to heat and pressure. It is less common than granite and sandstone, but is still quarried in some parts of Gujarat. Marble is used for a variety of purposes, including building construction, countertops, and sculptures.
Slate is a metamorphic rock composed of shale that has been subjected to heat and pressure. It is the least common of the four rocks mentioned, and is not quarried in Gujarat. Slate is used for a variety of purposes, including roofing, flooring, and countertops.