What are the classifications of pesticides according to their general use?

Some beneficial changes in pesticides and their use include all of the following except?

• A. pesticides which are less damaging to the environment B. pesticides which are safer to the users C. genetic engineering which may lead to pest resistant crop strains D. pesticides which kill only the target pest and do no harm to any other species E. very low rates per unit area are needed

• Answer:

  D is a bit weak. They do have pheromone traps that attract targeted species but it would be a bit of stretch to say that is a pesticide that only kills the targeted species. I think the word "may" is incorrectly used in C. I believe they already have those gm plants. It says in the article they have been planted commercially for eight years. http://www.gmo-compass.org/eng/agri_biotechnology/breeding_aims/147.pest_resistant_crops.html E is poorly worded.