Geometry

I need help in this question!!!
CD has an endpoint at (2,-1) and a midpoint at (8,3). which measure is closest to the length of CD?
A. 20.4 units
B. 8.4 units
C. 14.4 units
D. 11.7 units

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1. 2√((8-2)^2+(3+1)^2) = 14.4

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2. thank very much Steve

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