What Might Be One Reason Genetically Engineered Foods May Be

What might be one reason genetically engineered foods may be viewed as unhealthy by nutritional specialists?

A) They are initially produced in a laboratory.
B) They are often used to replace foods viewed as healthy.
C) They are heavily used in highly processed and fast foods.
D) They are less nutritional than the original, "natural" versions.
E) They taste better than more natural versions.