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 strato-sphere. 2. The photosynthesis by phyto-plankton in the oceans 3. The trapping of air in the polar ice capsWhich of the statements given above is/are correct ?

• A. 1 and 2
• B. 2 only
• C. 2 and 3
• D. 3 only