Which of the following is the strongest argumentative thesis?
选项：

A:Genetically modified foods have become a major concern of the society and have caused great controversy.;
B:While there may be economic benefits of growing genetically modified crops, there are negative health consequences for the people who consume them and for the farmers who produce them.;
C:This essay will discuss the health and safety issues as related to genetically modified foods.;
D:GM foods need to be tested on a case-by-case basis before introduction.