Acidification of oceans is increasing. Why is this incident a matter of concern? 1. Growth and survival of calcium phytoplankton will be adversely affected. 2. Growth and survival of coral reefs will be adversely affected. 3. The survival of some animals whose larvae are phytoplankton will be adversely affected. 4. Cloud seeding and cloud formation will be adversely affected.

• A. 1,2 and 3
• B. only 3
• C. 1 and 3
• D. all these