Suppose that your goal is to earn an “a” in this sociology course. your professor may have created a(n) by specifying an “a” as earning a test average of 90 percent or above.

The answer is Variable

Explanation: A variable is a quantity or a number that can vary or take on different values.

The variable is normally represented as a letter, in this case this number is represented as a "A".

The result of the variable focus on the experiment or the study.

There are three types of variable:  independent, dependent, and controlled.

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.