The answer is A. Granite.
Granite is an igneous rock, while the other options are all types of coal. Coal is a fossil fuel formed from the remains of ancient plants that have been buried and subjected to heat and pressure over millions of years. There are three main types of coal: lignite, bituminous coal, and anthracite. Lignite is the lowest grade of coal and is the most abundant type of coal in the world. It is soft and has a high moisture content. Bituminous coal is a higher grade of coal than lignite and is used to generate electricity and make steel. Anthracite is the highest grade of coal and is the most expensive type of coal. It is hard and has a low moisture content.
Granite is an igneous rock that is formed when magma or lava cools and solidifies. It is composed of three main minerals: quartz, feldspar, and mica. Granite is a very strong and durable rock and is used in a variety of construction applications, including building foundations, countertops, and monuments.