Your answer is B.) The Drug Enforcement Agency (DEA)
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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.
One of the main ways in which travel routes today differ from the trade routes of classical era civilizations is that they're far safer, since people have to worry much less about being robbed and/or injured--this is due mostly to government oversight and policing of the routes in question.<span />
The Sutras offer
information on a wide variety of topics that are important to Hindu
life. Sutras cover many topics, including grammar, law, rituals, and
astrology.