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答案：A
解析：
The formula for a circle with a center at (h,k) and a radius of r is: (x-h)^2+(y-k)^2=r^2
The length of the radius is half of the length of the diameter.
1/2*17=8.5
Using the coordinates of the center and the length of the radius of this circle in the equation yields: (x-(-100))^2+(y-221)^2=8.5^2
In standard form, the equation of this circle is: (x+100)^2+(y-221)^2=72.25
