[QA] Pesticides residues wind up in poultry, eggs, and butter because____.

Question:

Pesticides residues wind up in poultry, eggs, and butter because____.

• A.
  farmers are careless about cleaning their fields after harvest.
• B.
  crops grown for animal feed are sprayed with pesticides.
• C.
  cows and chickens drink large quantities of contaminated water.
• D.
  pesticides become harmless after killing insect pests.