Where there are several trustees, executors or administrators they shall all be made parties to a suit against one or more of them as provided in_________________?
A. O. XXI, R. 1 of C.P.C.
B. O. XXXI, R. 2 of C.P.C.
C. O. XXXI, R. 3 of C.P.C.
D. None of the these