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 carla
b. a hot dog stand
c. grilled onions
d. spending time with francis

"six months ago, several of molly's friends joined the trimtime fitness center. each of them participated in trimtime's weight-reduction and fitness regimen. all reported substantial weight reduction, and all are visibly slimmer. molly is convinced. she joins trimtime and enrolls in the program, hoping and expecting to see the same results. she is especially delighted to learn that trimtime had adjusted its program to make it even more effective in a shorter period of time." what is the feature in question/attribute of interest in this argument?