Answer:
Option (C)
Step-by-step explanation:
The coal is an organic sedimentary rock. These are formed from the dead remains of plants that were buried millions of years back.
In order to form coal, the tropical region is the most favorable place because it is the region in which maximum amount of sunlight and rainfall occurs. As a result of which the plants grow in a significantly large amount. These plants when died. they were decomposed and buried under the earth's surface. With the increase in time, more plants and trees were accumulated, which over a long period of time, turned into coal. It is mostly comprised of carbon in association with hydrogen, oxygen, sulfur, and nitrogen element.
Hence, the correct answer is option (C).