Which sentence would best conclude the last paragraph?
A.
Splenda and high-fructose corn syrup are also produced in labs.
B.
Companies offer "natural" products because they make and sell them cheaper than organic products.
C.
Organic peanut butter is harder to stir than natural peanut butter.
D.
Cattle herds are often fed raw corn and given antibiotics because they have trouble digesting corn.