When Giving a Lecture on GM Crops, What Concerns May

When giving a lecture on GM crops, what concerns may come up in conversation and what research supports or does not support these concerns?

A) Environmental issues such as the growth of monarch butterflies on GM corn, however research shows us that milkweed is the preferred site of egg laying.
B) Gene flow from GM crops into wild plants. Certain plants such as soy are grown in places where there are no related plants and therefore genetic information can not cross over.
C) Can GM foods be harmful when ingested. Proteins engineered into crops in the USA to produce glyphosate tolerance have not been shown to activate allergic responses.
D) The destruction of all insects with inserted genes for toxins. Research shows us that even with the death of many insects some will always survive.