The U.S. dollar was important to international economies in the mid 20th century because countries valued the U.S. dollar with gold standard.
The history of the US dollar began with efforts by the USA's Founding Fathers to establish a national currency based on the Spanish silver dollar, which had been in use in the UK's North American colonies.
The new Congress's Coinage Act of 1792 established the US dollar as the country's fashionable unit of money, establishing the US Mint tasked with generating and circulating coinage.
Initially described as a bimetallic fashion in terms of a hard and fast amount of silver or gold, it officially followed the gold fashion in 1900, and subsequently removed all hyperlinks to gold in 1971.
Since the founding of the Federal Reserve System in 1913 as the crucial financial institution of the USA, the greenback has been typically issued in the shape of Federal Reserve Notes.
The United States greenback is the world's number one reserve currency, held by governments internationally to be used in worldwide trade.
The US Mint began producing the US greenback in 1792 as a neighborhood model of the famous Spanish greenback, or piece of 8, which was produced in Spanish America and widely circulated in the Americas.
The Spanish, US, and Mexican silver dollars all circulated side by side in the United States, and the Spanish dollar and Mexican peso remained illegal until the Coinage Act of 1857.
So it's clear that alternative B, countries valuing the U.S. dollar quite due to the gold fashion, is the suitable answer.
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