The answer is to use credit when you need to not when you want to.
The Cash and Carry Policy was all of the items purchased had to be paid with cash and then shipped from the United States on the buyers on personal ships. President Roosevelt got around the cash and carry requirement when Britain couldn't meet the terms anymore by creating the "Land-Lease Act." This allowed the United States to lend or lease arms to any country that was considered a vital asset to the defense of the United States.
Well we know that it is not A or C, Reason: Some states have up to 5m people in it. (For example about 8 live in just new York alone.)
And we also know its not 10 billion. Reason for this: Scientist have proven that there is no more then 8 billion people today.
And so now we got 6.5 billion is the closest, the real number is about 7.5 billion.
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He wanted it to reflect European culture