The correct option is B Smell
Jacobson's organs are also known as vomeronasal organs. These are the organ of chemoreception that is part of the olfactory system of amphibians, reptiles, and mammals concerned with smell. It is a patch of sensory cells found in the main nasal chamber and the function of the vomeronasal organ is the detection of pheromones, chemical messengers that carry information between individuals of the same species. It was discovered by Ludvig Levin Jacobson, in 1811. Hence option B is correct.