(D) The efficiency $(\eta)$ of a transformer is defined as the ratio of output power to input power.Input power $(P_{in})$ = $V_p \times I_p = 220\, V

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(D) The efficiency $(\eta)$ of a transformer is defined as the ratio of output power to input power.Input power $(P_{in})$ = $V_p \times I_p = 220\, V \times 5\, A = 1100\, W$.Output power $(P_{out})$ = $V_s \times I_s = 11\, V \times 90\, A = 990\, W$.Efficiency $(\eta)$ = $(P_{out} / P_{in}) \times 100$.$\eta = (990 / 1100) \times 100 = 0.9 \times 100 = 90\,\%$.