Depnds
Positioning with R1/R3 depends on whose mechanics system you follw. FED uses C, the UDP uses B.
I use B. More things can happen over on the right side of the infield. The only benefit to C is that you can keep up the misguided myth that the runner on third is SO important that you should say close to him (corollary myth: in three man there should always be an umpire ahead of the lead runner).
Rich
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