●In the flange coupling the two flanges are coupled together by means of bolts fitted in reamed holes.

●The holes in the flange coupling for coupling the two flanges together by bolts are reamed because it permits equal load sharing in bolts.

●Reaming is a process which slightly enlarges a pre-existing hole to a tightly toleranceddiameter. A reamer has several cutting edges.

Hence, the correct option is (A)