A government regulation is that the answer!!
Well, I can tell you for sure that a is not the answer. But I think the answer would be b.
Answer: B
Explanation: The U.S. dollar was no longer backed by gold.
<span>The </span>Sherman Antitrust Act<span> (</span>Sherman Act, 26 Stat. 209<span>, </span>15 U.S.C. §§ 1–7<span>) is a landmark federal statute in the history of </span>United States antitrust law<span> (or "</span>competition
law<span>") passed by Congress in 1890. Passed under
the presidency of </span>Benjamin
Harrison<span>, it prohibits certain business activities that
federal government regulators deem to be </span>anti-competitive<span>, and requires the federal government to
investigate and pursue </span>trusts<span>.</span>
