Which of the Following Is Not True

Which of the following is not true?

A) Planting genetically uniform crops makes them more vulnerable to diseases and pests.
B) Planting diverse crops makes them less vulnerable to widespread disease but more vulnerable to pests.
C) Planting a crop that consists of a single high-yielding genetic variety has its dangers.
D) Planting diverse crops makes them less vulnerable to widespread disease and less vulnerable to pests.