Which example below is a concern related to the debate over plant biotechnology?

The complete question is:
Which example below is not a concern related to the debate over plant biotechnology? A) human health issues (such as allergies) associated with transgenic crops 
B) novel organisms will be introduced into the biosphere 
C) effects on nontarget organisms, such as insects that feed on nearby plants 
D) Bt maize contains high levels of the cancer-causing toxin fumonisin 
E) introduced genes leading to the creation of "superweeds"

The correct answer is D) Bt maize contains high levels of the cancer-causing toxin fumonisin