Question: As a result of rain forest deforestation, some organisms lose their habitats. Which is also an effect of rain forest deforestation?

What is the correct answer to the question from the following choices?
OPT: I. a decrease in the rate of soil erosion II. a decrease in the fertility of the topsoil III. an increase in the production of plants used for medicines IV. an increase in the amount of oxygen produced in the atmosphere
II.