Q: Millions of years ago, plants used energy from the sun to form what?


Read this paragraph and choose the correct option from the provided answers:

Fossil fuels include coal, oil, and natural gas. Fossil fuels are the greatest energy source for modern society. Millions of years ago, plants used energy from the Sun to form carbon compounds. These compounds were later transformed into coal, oil, or natural gas. Fossil fuels take millions of years to form. For this reason, they are non-renewable. We will use most fossil fuels up in a matter of decades. Burning fossil fuels releases large amounts of pollution. The most important of these may be the greenhouse gas, carbon dioxide.

 Choices:

- fossil fuels

- evolution

- greenhouse gases

- carbon compounds


A:
carbon compounds