I believe it's C. Skilled Labor.
The Social Contract and Government
The fundamental basis for government and law in this system is the concept of the social contract, according to which human beings begin as individuals in a state of nature, and create a society by establishing a contract whereby they agree to live together in harmony for their mutual benefit, after which they are said to live in a state of society. This contract involves the retaining of certain natural rights, an acceptance of restrictions of certain liberties, the assumption of certain duties, and the pooling of certain powers to be exercised collectively.
Liberties, the rights that are given to each individual.National Government, the central government was not given all the power, it was distributed between the central and state government. This allowed for liberties of individuals to be protected within states and also the governments shared powers so the National Government wasn't the all-powerful.
The answer is "C" the raising of tariffs in different countries throughout the world led to a restriction of trade.
