The correct answer is It relates results to an original event.
One of the ways to improve arguments in a text is by using cause and effect structures.
In this example, john's whistling is serving as a discriminative stimulus.
This procedure, studied by Ivan Pavlov, shows a stimulus ( in this case the action of John's whistling) and a response ( the cattle run to the food trough).
Pavlov studied it with dogs. He realised that when a trainer fed them, dogs salivated. So, he presented the dogs with a "stimulus" ( the sound of a metronome) and when he gave the dogs food. After a few repetitions, when the dog listened to the stimulus, it salivated.
B. saved lives. Mandatory seatbelt laws have saved lives.
No; it is located on a river, not an ocean, a sea, or a lake. Is the capital of Alaska east or west of the capital of Hawaii? ... Name the gulf that is just south of Alaska.