After hearing about jon's very high achievement scores in mathematics, ms. ketel realizes how smart jon is and expects that he will do well in the upcoming unit on algebra. later, jon performs very well, just as she had expected. interestingly enough, however, the achievement scores ms. ketel originally received were incorrect. jon was actually a below-average student in his mathematical achievement. what concept most likely refers to jon's change in performance?

the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.