Explanation

The easiest way to go about it is to plug the values for the options.

So

A. New York: 129,700 – 42,250 = 87,450
B. Boston: 126,00 – 30,000 = 96,000
C. Newark: 116,000 – 29,450 = 86,550
D. Danbury: 95,950 – 19,750 = 76,200
E. Pittsburgh: 54,150 – 11,500 = 42,650

Hence clearly option B is correct.
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One way to reduce time on this problem rather than calculating each difference would be to compare the variables. For instance, NY:130 is 4 more than 126 but Boston's 30 is 12 less than 42, so Boston has a bigger gap.
Newark's gap is 10,000 less than Boston, so it's not that. Danbury's first number is 30,000 less, second number is 10,000 less, which still is 20,000 smaller of a gap. Pittsburgh is obviously out because the gap is blantantly much smaller. That way the answer can be found in a matter of seconds just from looking and comparing variables, rather than spending all of the time to calculate the answer.

Thanks, calculating takes a lot of time, of course!