Alec Wants to Train His Dog Magnus to Sit on Command

Multiple Choice

Alec wants to train his dog Magnus to sit on command. To achieve this goal, Alec starts by giving Magnus a strip of bacon and saying "sit" every time Magnus sits. A day later, Alec gives Magnus a strip of bacon and a pat on the head and says "sit" every time Magnus sits. Magnus seems to learn to sit on command. However, after a few days of training, Alec notices that Magnus now salivates and wags his tail whenever he hears the word "sit."
-For a week after his training,Magnus would sit down and start salivating whenever he saw Alec.This is because Alec was a ______________.

A) positive reinforcer
B) conditioned stimulus
C) unconditioned stimulus
D) negative reinforcer