most electricity is generated using ____________. a. petroleum b. oil c. coal d. natural gas please select…

Brief Explanations:

Coal has been one of the most widely - used sources for electricity generation historically due to its abundance in many regions and relatively lower cost in some cases compared to the others in the list. While the share of coal in electricity generation is changing with the growth of renewable energy and natural gas, it still has been a major source for a long time.

Answer:

C. coal