Why Did the Chemical Company Monsanto, Which Makes the Chemical

Why did the chemical company Monsanto, which makes the chemical weed killers Roundup, want to get involved in genetically engineering crops?

A) Because in this day and age, genetic engineering is the most advanced way to make chemical products like Roundup.
B) So they could engineer crops that could produce their own Roundup.
C) So they could engineer crops that could produce their own Bt toxins.
D) So farmers growing their crops would need fewer herbicides to kill weeds.
E) If crops could be engineered to resist the herbicide Roundup, it would be easier to effectively kill off weeds growing around the crops without killing the crops.