The Navajo were especially valued by the military because they could be used as code talkers and translators
The correct answer is C) Economics.
The study of how people satisfy unlimited wants with limited resources is called Economics.
Economics studies the production, distribution, and how people consume products and services in a determined market. Economics based its studies on the belief that resources are limited but people in a society have many wishes, desires, wants, and needs. So Economics studies all the factors involved in the process of getting raw materials and natural resources, fabrication, supply, delivery and the prices people pay to get something they want or need.
Answer: He enforced the Sherman Antitrust Act.
Context/history:
The Sherman Anti-Trust Act was the first measure by Congress to prohibit trusts. It was passed by Congress in 1890. A trust was when stockholders in multiple companies transferred their stock shares to a single group of trustees. Thus a whole industry area could be dominated by a single "trust" organization, destroying the free market of business competition. This was a monopolistic practice which the Sherman Anti-Trust Act ended. Thus the Sherman Anti-Trust Act directly went against the idea of those who believed business success should be based on large business owners colluding with one another.
Initially the Sherman Antitrust Act was not well enforced by US courts. But when Theodore ("Teddy") Roosevelt took office as President in 1901, he pushed enforcement of the Act and worked to reign in the power of big businesses.
Note:
The Clayton Antitrust Act was passed by Congress in 1914, after Teddy Roosevelt was no longer President.