Laurita and Trey notice that the two hermit crabs in their class prefer peanut butter over the crab food from the pet store. They conclude that all hermit crabs prefer peanut butter to the crab food. Why is their conclusion flawed? A) They have made a valid conclusion. B) They should have given the crabs more choices of food C) They should design an experiment with a control and use a much larger sample size. D) They should design an experiment to test the preference of the two crabs with a control.