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 consumer demand because the members have to be aware if people are going to buy what they want to sell in this case either energy drinks or a car wash.

all freedom fighters demanded for constitution. so british finally granted india it's freedom. then a constituent assembly was formed. it's chair man was rajendra prasad and its deputy chairman was dr. br ambedkar.

this assembly take the time of about one year than our constitution was finally formed.

explanation: