The correct answer is: D) Lignite
Lignite is the lowest rank of coal, and is the most abundant type of coal found in Telangana. It is a soft, brown coal that is formed from plant material that has been buried and subjected to heat and pressure for millions of years. Lignite has a high moisture content and a low carbon content, which makes it less energy-dense than other types of coal. However, it is also less expensive to mine and transport, which makes it a viable option for power generation in some areas.
Anthracite is the highest rank of coal, and is the most carbon-rich type of coal. It is a hard, black coal that is formed from plant material that has been buried and subjected to heat and pressure for hundreds of millions of years. Anthracite has a low moisture content and a high carbon content, which makes it the most energy-dense type of coal. However, it is also the most expensive to mine and transport.
Bituminous coal is a medium-rank coal that is formed from plant material that has been buried and subjected to heat and pressure for millions of years. Bituminous coal has a higher moisture content and a lower carbon content than anthracite, but it is still a relatively energy-dense type of coal. It is also less expensive to mine and transport than anthracite.
Sub-bituminous coal is a low-rank coal that is formed from plant material that has been buried and subjected to heat and pressure for millions of years. Sub-bituminous coal has a higher moisture content and a lower carbon content than bituminous coal, but it is still a relatively energy-dense type of coal. It is also less expensive to mine and transport than bituminous coal.