At one time, the united states used a(n) to prohibit the import of all products made in cuba.

Explanation:

Embargo is the total prohibition of importing certain goods in a country. It is a governmental order that restricts commerce of certain goods with specified countries.

The first embargo U.S imposed on Cuba was on March 14, 1958 regarding the sale of arms. Then, another embargo was imposed on February 7, 1962 which prohibited sale and purchase of Cuban goods in almost all exports and imports.

Today some relaxations have been made on certain products, however, Cuba is still under embargo in the U.S.

the correct answer is "c: merchants" and "e. soldiers".

the song dynasty was known as the first government in the world to introduce paper currency. it was also the first chinese government which established a permanent standing navy. finally, the first compass was introduced during this period of government.

all of these innovations heavily affected commerce in a positive way. printed money dynamize commerce within the borders of the empire due to an easier way to quantify value during the trade. the introduction of the compass trade routes to be faster. finally, the introduction of a standing navy regulate trade routes.

regarding military affairs, gunpowder was created during this period. this was a tremendous improvement that was widely utilized by the military in order to innovate in the manufacturing of weapons.

your answer would be (b)