One of Pavlov's dogs had stopped salivating at the sound of the tone. The next day the tone was presented again and the dog began salivating. Pavlov referred to this as

A) spontaneous extinction.
B) shaping.
C) stimulus generalization.
D) spontaneous recovery.
E) higher-order conditioning.

D. Spontaneous recovery

Explanation:

Spontaneous Recovery is the reappearance of an extinguished conditioned response, usually after a period of rest.  

The dog salivating at the sound of the tone the next day after previously stopped salivating the previous day is an example of a spontaneous recovery

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.

if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic