Animal feed should not include genetically modified plants. A study found that laboratory rats fed genetically modified potatoes for 30 days tended to develop intestinal deformities and a weakened immune system, whereas rats fed a normal diet of foods that were not genetically modified did not develop these problems. Which one of the following, if true, most weakens the argument?
A: The researchers conducting the study were unable to explain how the genetic modifications of the potatoes would have caused the intestinal deformities or a weakened immune system in the rats.
B: Potatoes are not normally a part of the diet of laboratory rats.
C: The rats tended to eat more of the genetically modified potatoes at the beginning of the 30 days than they did toward the end of the 30 days.
D: Intestinal deformities at birth are not uncommon among rats bred in laboratory conditions.
Choose A, B, C or D as your solution.
B