Which of the following statements about organic food production is true?

A. Organic farming has allowed U. S. agriculture to become the most efficient and productive in the world.

B. It may involve the use of antibiotics and hormones for livestock, as long as no chemicals are added to crops.

C. Organic livestock must be fed organic feed.

D. The soil is fertilized with commercial inorganic fertilizer, with the use of cover crops every fourth year.

E. Organic farms must be kept insect-free to allow for the crops to survive without the use of pesticides.