Judge the Following Sentence According to the Criteria Given Below

Multiple Choice

Judge the following sentence according to the criteria given below: Earth's climate for the next several hundred thousand years depends strongly on the carbon emissions we put into the air over the coming century BECAUSE as much as 25% of the carbon-dioxide in an emissions spike can persist for tens of millennia.

A) The assertion and reason are both correct, and the reason is valid.
B) The assertion and reason are both correct, and the reason is invalid.
C) The assertion is correct and the reason is incorrect.
D) The assertion is incorrect and the reason is correct.
E) Both the assertion and the reason are incorrect.