【单选题】

E、outlining the specific reasons why a long standing problem in solar physics is thought to be soluble at last

22. Which of the following statements concerning the comparison between pre- industrial and post-industrial climate change, as described in the passage, is accurate
A、The pre-industrial period experienced a much greater degree of climate change, owing to solar activity.
B、The post-industrial period experienced a much greater degree of climate change, owing to greenhouse gases.
C、Both periods have experienced a degree of change, but their primary causes are different.
D、Both periods have experienced a degree of change, and their primary causes are identical.
E、Scientists have yet to prove that climate change is linked to either sunspots or greenhouse gases.