Which of the Statements Below About the Behavioral Effects Governed

Which of the statements below about the behavioral effects governed by for^S and for^R in Drosophila is NOT correct?

A) The for gene encodes a cGMP-dependent protein kinase.
B) This enzyme phosphorylates target proteins in the brain and affects neuronal activity.
C) In the absence of food, both sitters and rovers move about in search of food.
D) In the presence of food, sitters remain stationary and eat, whereas the rovers move all around the food and eat.
E) The sitter behavior is not adaptive because foragers will obtain all the food from the surrounding environment.