Which sentence in the following paragraph best illustrates generalization?a. A researcher uses classical conditioning to teach a dog to respond to a bell by salivating. b. As the researcher pairs meat powder with a ringing bell, the dog begins to associate the ringing of the bell with the powder, and it salivates in response to the bell alone. c. The researcher tests several bells that sound very similar to the original bell, and the dog salivates. d. The researcher then tests varying tones that elicit no response from the dog. e. After a pause, the bell is presented alone again, and the dog does respond by salivating. f. Over time, the dog responds more and more weakly to the bell because it is not presented with the meat powder. g. Eventually, the dog learns to ignore the bell altogether.