Read the scenario below and answer the question that follows.Francis enjoys spending time with his girlfriend, Carla. Carla will often eat a large number of grilled onions before spending time with Francis. One day, Francis walks by a hot dog stand and smells some fresh grilled onions. Suddenly, Francis has a great desire to see Carla.What is the neutral stimulus (NS) in this scenario?A.spending time with CarlaB.a hot dog standC.grilled onionsD.spending time with Francis