Hello!
The experiment this question refers to is Pavlov's Dogs.
Ivan Pavlov was a russian physiologist who is most known for his work with classical conditioning.
Answer: A
Explanation:
For one you just have to use common sense it the only one t home and this affected the greatly from candles to lightbulbs
Yes ............. i think thats what u asked
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Ur answer would be B. Trade Became Much Easier.