Study the following statements about breathing.
A. It is a process which provides oxygen to the body.
B. In this process water is produced in the cell.
C. This process helps the body to get rid of carbon dioxide.
D. In this process food breaks down to release energy.
The combination of statements that gives the correct functions of breathing is:
1. A and C only
2. C and D only
3. A, B and D
4. A and B only