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To buy expensive machinery
The correct answer is - D. It was widely agreed that a traditional invasion of Japan would drag the war on for years and lead to may, may more deaths than the atomic bomb.
The US officials decided to use the atomic bombs on Hiroshima and Nagasaki in Japan because of two reasons. The first and more important one was to put an end to the war as quickly and efficiently as possible, minimizing the deaths of their troops as much as possible. The second one was to create an image of a country that reached a level of global military power, in order to boost its global reputation and cause fear at other nations.
Both of those things worked out very fine for the USA. They ended the war with Japan in no time, and they gained a status of a global military powerhouse.
The United States had access to vast natural resources and this feature of the United states helped industry grow quickly in the country after the Civil War. The correct option among all the options given in the question is option "C". The American Civil War happened from 12th of April in the year 1861 to 9th of May in the year 1865.