Which Statement About the Knockout Experiments Concerning Pheromone Receptors in the Vomeronasal

Which statement about the knockout experiments concerning pheromone receptors in the vomeronasal organ (VNO) of mice is false?

A) The experiments revealed the number of genes controlling mating behavior in mice.
B) Mating behavior in male mice does not require VNO receptors.
C) VNO receptors appear to be essential for male mice to identify the sex of other mice.
D) A male mouse with VNO receptors is typically aggressive toward other male mice.
E) In the absence of VNO receptors, a male mouse will attempt to mate with another male mouse.