Convert the fraction to a decimal, then subtract from the total to find the missing part.

Convert known fraction	=	\(\frac{7}{1000}\) = 0.007
Missing part	=	5.207 - 0.007 = 5.200
As mixed number	=	5.200 = 5\(\frac{1}{5}\)
Check options: 3\(\frac{1}{2}\) = 3.5, 5\(\frac{2}{100}\) = 5.02, 6\(\frac{2}{100}\) = 6.02.
None equals 5\(\frac{1}{5}\), so the answer is "None of the above".