Which of the Following Statements About Insecticides Is True

Which of the following statements about insecticides is true?

A) To control agricultural pests,pest management uses biological controls,chemicals,or cultural methods,but never a combination of these.
B) Prey species often have a higher reproductive rate than do predators.
C) Simply killing many individuals is often the best way to reduce the size of a pest population.
D) Most insecticides kill the pest but not the pest's natural predators.