Here's a problem to solve: Forests have been cut and burned so that the land can be used to raise crops. Which consequence does this activity have on the atmosphere of Earth?

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

- A: It reduces the amount of carbon dioxide production.
 
- B: It reduces the production of oxygen.
 
- C: It decreases the greenhouse effect.
 
- D: It decreases pollutants in the air.
 