Ideally, a patent should cover a long enough period of time for the inventor to but that period should not be so long that it allows the inventor to
a. earn a hearty return; charge a high monopoly price permanentlyb. contribute to the social interest; only receive a slice of the social benefitsc. earn a rate of return; prevent broad public access to classic worksd. contribute to the social interest; prevent broad public access to inventions

option A.

Explanation:

The correct answer is option A.

A patent should cover a long enough period so that the inventor can earn a hearty return.

the period should not be so long that it allows the inventor to charge a high monopoly price permanently.

When researcher invents something new then they can patent the technology.  

By patenting the technology the scientist can earn money if the people use his technology.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.

new communications technology has affected the way social movements are organized because nowadays, social movements rely on social networks and the media to get different people with a similar way of thinking in contact, and thus, get them to mobilize for a greater cause.

individuals only participate in collective action when they feel identified with it. is in this aspect that social media becomes relevant, because it guarantees communication among all individuals and organizes the social actions that are going to be carried out, i.e., the social movements.

in addition, being covered by the media is important to validate the message and make it relevant in the social agenda, as well as to reach more people who can share interests, appealing to public sympathy for their cause.

in conclusion, it is by social networks and social media that social movement is given birth; by connecting different individuals with similar ideas and organizing them to mobilize for a greater cause.