Answer the following question given this paragraph: 

Coal is a solid hydrocarbon. Coal is useful as a fuel, especially for generating electricity. Coal is relatively inexpensive and abundant. Developing nations, like China, rely heavily on coal. Around the world, coal is the largest source of energy for electricity.


Q: What type of hydrocarbon is coal?

 Choices:

- mineral

- gas

- liqued

- solid

A:
solid
