The Development of Bt Crops Raises Concerns Because

The development of Bt crops raises concerns because

A) Bt crops have been shown to be toxic to humans.
B) pollen from these crops is harmful to monarch butterfly larvae in the field.
C) if genes for Bt toxin "escape" to related weed species, the hybrid weeds could have harmful ecological effects.
D) Bacillus thuringiensis is a pathogen of humans.
E) Bt toxin reduces the nutritional quality of crops.