What is a major advantage of herbicide-resistant crops?

• A. They have greater nutritional value.
• B. They are more resistant to disease.
• C. They produce toxins that kill insects but are harmless to humans.
• D. They allow farmers to use as much herbicide as they want without worrying about harming the crops.
• E. They allow farmers to "weed" with herbicides, cutting down on soil tillage and erosion.