How is the environment affected when natural pesticides are used in organic farming?

Question

A) Since natural pesticides are less harmful than synthetic ones, there is less risk of harm to humans or wildlife.

B) Natural pesticides are used less often than synthetic ones since there are fewer pests in organic farming; because of this, nearby animals are healthier.

C) Natural pesticides are tested more than synthetic ones, so they are proven to have fewer impacts on the soil.

D) Since natural pesticides are usually not as effective as synthetic ones, farmers have to apply them more often. This means the compounds in the natural pesticides that may end up on organic foods could be above the safe limits set by farming standards.