Which of the following gaseous fuels is obtained by dry distillation of coal?

We must talk about the gas compositions provided to us in the options in order to respond to this question.
We start with natural gas. It is a hydrocarbon gas that occurs naturally and is often referred to as fossil gas. It consists mostly of methane mixed with various higher alkanes; a trace amount of nitrogen, carbon dioxide, helium, etc. is also present.
Next comes water gas. Carbon monoxide and hydrogen combine to form water-gas. We employ it in fuel cell applications to eliminate carbon monoxide. Due to the use of water steam in its production, water-gas is known as "water" gas. When steam is blasted into white-hot hard coal or coke, carbon monoxide and hydrogen are produced.

We next go on to producer gas. In order to thoroughly gasify the fuel, heated coal or coke is blown through with steam to create producer gas, a flammable gas. Along with nitrogen, its primary constituents are hydrogen and carbon monoxide. Additionally, it might have some carbon dioxide in it. It is mostly utilised as fuel in big industrial furnaces.
Finally, there is coal gas. It is a coal-based fuel that is flammable. It is created by intensely heating coal without any air. We are aware that heating without air breaks down organic materials. Dry distillation is the name of this procedure. Gases are produced by the dry distillation of solids, while coal gas is produced by the dry distillation of coal.