Considering the Complex Problem of Whether Natural Gas Should Replace

Considering the complex problem of whether natural gas should replace coal as a fuel source for electricity production, you identify environmental and public policy issues and connect it to the disciplines of Earth science and biology because they focus on the environment, and political science because it focuses on the process of passing environmental legislation and enforcing regulations. The disciplines of Earth science, biology, and political science are

A) Potentially relevant.
B) Definitely relevant.
C) Irrelevant.