Genetically Modified, Pest-Resistant Crops

Genetically modified, pest-resistant crops:

A) may contain the gene from Bt.
B) have been shown to be completely safe for non-pest insect species, such as the monarch butterfly.
C) have not yet been developed.
D) may become invasive pests or persist in the environment longer than unmodified crops.
E) require more frequent applications of pesticide, although in lower doses, than unmodified crops.