Here's a problem to solve: As a result of rain forest deforestation, some organisms lose their habitats. Which is also an effect of rain forest deforestation?

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

- A: a decrease in the rate of soil erosion
 
- B: a decrease in the fertility of the topsoil
 
- C: an increase in the production of plants used for medicines
 
- D: an increase in the amount of oxygen produced in the atmosphere
 