When Luke kissed Laura, her heart rate increases. Luke always wore Old Spice After Shave. Whenever Laura smelled Old Spice, her heart would race. Laura's increased heart rate when she smelled Old Spice was the:

a. unconditioned stimulus.
b. unconditioned response.
c. conditioned stimulus.
d. conditioned response.

Answer d % correct 77 a= 11 b= 1 c= 11 d= 77 r = .39