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Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but, a lot of it does not remain in the lower atmosphere because of

1. its escape into the outer stratosphere.

2. the photosynthesis by phytoplankton in the oce Exp.

3. the trapping of air in the polar ice caps.

Which of the statement(s) given above is/are correct?

A)  1 and 2           

B)  Only 2

C)  2 and 3           

D)  Only 3