Fabian ordered chicken from a national chicken chain restaurant and became very ill immediately after eating it. Years later, Fabian still feels queasy when he sees an advertisement for the chicken chain or drives by one of its establishments. In this example, the unconditioned stimulus is the:

I’m going to guess these are the choices: a) recreational skiing developed in the mid-19th century b) it was originally invented as a way of getting from place to place in snowy regions c) downhill skiing is currently the only common form of the sport d) it mostly evolved from snowshoeing- if that’s the cases then the answer would be c) downhill skiing is currently the only common form of the sport