PART A: Which statement best expresses the central idea of the text?
A.
Carbon dioxide is a naturally produced gas that is necessary for our atmosphere to trap heat and support life on Earth.
B.
While carbon dioxide is a greenhouse gas and contributes to global warming, burning fossil fuels is necessary to power modern technology.
C.
Humans have altered the surface of the Earth through deforestation and development, and it is no longer able to adequately reflect heat.
D.
Humans are responsible for the rising level of greenhouse gases in the atmosphere, and the resulting warming of the Earth.
