A bank of three single-phase transformers, each rated 30 MVA, 38.1/3.81 kV, are connected in Y-Δ with a balanced load of three R = 1 Ω , wye-connected resistors. Choosing a base of 90 MVA
A) 1 pu
B) 1.5 pu
C) 2 pu
D) 2.5 pu