【单选题】If you are going to create a tangent arc between two arcs that cannot intersect, to find the center of the tangent arc you must set your compass to a radius that is:
A.
the existing arc radius minus the tangent arc radius
B.
centered at the tangent point of the new arc and the existing arc
C.
the existing arc radius plus the tangent arc radius
D.
the sum of the two existing arc radii