The material A is fossil fuel which is extracted from the earth. It is said to be formed from the buried , large land plants by a very slow process B. When A is heated in the absence of air in a process called C, then it gives three products D, E, and F. The product D is used as a reducing agent in the extraction of metalling the roads .
a) What could material A be ?

Explanation

The material A is Coal. Coal is a fossil fuel. It was formed by the process of carbonisation. Carbonisation is the process by which plant material or vegetation buried deep under the earth was slowly converted into coal. This is a very slow process and usually takes millions of years.