Which of the following is not the belief of an organic farmer?

• A
  The more variety a landscape has,the more sustainable it is.
• B
  The insects that are sometimes called pests are not eradicated,but instead are kept at manageable levels by a complex system of checks and balances within a living and vibrant ecosystem.
• C
  For controlling plant diseases and pests,chemicals like insecticides and pesticides should be used extensively.
• D
  Eradication of the pests is undesirable because they act as food or hosts for beneficial predatory and parasitic insects.