The correct option is B Smell
Jacobson's organ is an organ of chemoreception, which is majorly found in the olfactory system of amphibians, reptiles, and mammals, although it does not occur in all tetrapod groups. It is also known as vomeronasal organ. Airborne odours, in contrast, are detected by the olfactory sensory cells located in the main nasal chambers. Some groups of mammals, also initiate a behavior known as the flehmen response, in which the animal facilitates the exposure of the vomeronasal organ to a scent or pheromone by opening the mouth and curling the upper lip during inhalation.
Therefore, the correct answer is option B.