Here's a problem to solve: Which statement accurately describes an interaction between plants and animals?

Among the 4 following options, which is the correct answer?

- A: Plants provide humans with CO_2 for respiration.
 
- B: Animals release CO_2, required for photosynthesis.
 
- C: Plants provide humans with atmospheric nitrogen.
 
- D: Animals release O_2, required for plant survival.
 