As shown per dwg, -C- can only be a tangent pt on the radius, parallel to -B- @ -A-. A fixture could simulate the datums and help set up the CMM inspection axis.
Or, this can be set up @ CMM by:
1. Taking pt's on the radius common to -C-
2. Using resulting radius Center Point offset to -B- as defined by Basic dimentions.
(I do have a problem with that alignment: the radius is less than 90 degree's & near formed area, not good. The radius next to Limit Pt K would be better).
The long vertical edge common to Limit Pt K would seem to be a good candidate for a Datum Targe -C-, however, that edge has more tolerance, so we don't want to use it. The small hole would also seem to be a candidate, but it is only about 1/3 the total length, so we don't want to use that either.
This part will probably need Best Fit ran in order to see actual condition.