300 million years ago, wisconsin was once covered with rock, while West Virginia was covered with swamps. Why do you think west virginia today produces a lot of bad and oil, while wisconsin does not?

Because of the number of organisms present.

Explanation:

It has been discovered that oil was formed through the accumulation and conversion processes that occurred to the remains of dead animals in the soil.

And since the west Virginia was covered by swamp in about 300 million years ago, it probed to having more animals than that of Wisconsin that was covered by rocks, therefore the possibility of having oils.

a and b

the real answer is b. scintillation counter