Those in favor of using the atomic bomb argued that a mainland invasion of Japan would O fail to demonstrate the power of the US Navy.
O lead to massive death and destruction in civilian areas.
o open the United States to criticism from Allied partners.
O cost hundreds of thousands of American soldiers' lives.

B

Explanation:

Those in favor believed that attacking Japan from the main islands would cost more lives than through two atomic bombs.

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Cost hundreds of thousands of American soldiers' lives.

Explanation:

This is how President Truman felt.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;