What is the theory of improving human population through genetics?
a. genocide
b. hereditary
c. sterilization
d. eugenics

The correct answer is D. Eugenics.

Explanation

Eugenics, is a theory that was booming during the late nineteenth century with the emergence of social Darwinism, this theory suggests that the human can be improved by genetic intervention. In parallel, it promotes the nonprocreation of people who do not possess qualities such as high altitude, intelligence, good health, strength, among others. During the twentieth century, in the midst of governments with nationalist tendencies in Europe, the practice of eugenics took place by means of forced sterilization, reaching genocide, as occurred in Nazi Germany. So, the correct answer is D. Eugenics.

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.