Which of the Following Statements About the Detection of Chemical

Which of the following statements about the detection of chemical stimuli is false?

A) Snakes use their tongues to smell.
B) Many mammals have a vomeronasal organ to detect pheromones.
C) A greater frequency of action potentials is associated with perception of a more intense smell.
D) Taste buds are confined to the oral cavity in aquatic animals.
E) Chemoreceptors monitor aspects of the internal environment.