I voted other. Statement B is correct IMHO. I think our climate is changing. However climate has never been stable throughout the eons. I think man is certainly partly responsible for climate change. It is all part of the famous J-curve. When a certain species appears its numbers will increase, if the increase is rapid and uncontrolled some event that is catastrophic to that species will cause a rapid decline in numbers or even extinction.
As there are too many hunmans on this planet, sooner or later there will be a decline in numbers one way or another. The current human population is only sustainable due to modern technology which is fossil fuel based.
That's why I voted for the option "other".