Which Is Not a Valid Argument Supporting the Continued Use

Which is not a valid argument supporting the continued use of fossil fuels?

A) We will still be using only a small fraction of the total usable surface of the earth if we open new,formerly protected areas to exploration.
B) We are continuing to find more efficient ways to use fossil fuels as energy resources.
C) We will recover more from a particular source than we were able to in the past as we improve the technologies by which we recover these fuels from the earth.
D) We are improving the technologies used to remove pollutants from our fossil fuels before we use them and from the materials produced after we use them.