coal, oil, and gas. coal, shale, and quartz. shale, quartz, and coal. oil, shale, and granite.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Decayed prehistoric plants have helped in the formation of
Possibilities:
- coal, oil, and gas.
- coal, shale, and quartz.
- shale, quartz, and coal.
- oil, shale, and granite.

coal, oil, and gas.