Explanation:

- Lignite

- A low-grade brown coal.

- Soft with high moisture content.

- Often used for electricity generation.

- Correct Answer

- Bituminous

- Medium rank coal.

- Contains higher carbon than lignite.

- Used in power generation and steel production.

- Anthracite

- Highest grade of coal.

- Hard and has a high carbon content.

- Used in heating and industrial processes.

- Peat

- Precursor to coal.

- Formed from decayed plant material.

- High moisture and lower carbon content than lignite.