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In the diagram, the circle will be dilated by a scale factor of 3 about the origin. The points C, A, and B map to C', A', and B' after the dilation. What is the length of ? Use the distance formula to help you decide: .

Graph of properties of dilations on a coordinate plane. Circle is centered at point C equals (8, 10) in quadrant 1. Point A equals (8, 15) on top, and point B equals (12, 13) on top right are marked on circumference.
A.
5 units
B.
15 units
C.
21 units
D.
24 units
E.
45 units