Correct answer is (a) Minimum induced drag
The best explanation: The coefficient of induced drag is CD,i=\(\frac {C_l^2}{\pi eAR}\). For an elliptic wing, e = 1 and/or δ = 0 i.e. the induced drag is minimum. The aspect ratio for the elliptic wing is not lowest. Moreover, we need a higher aspect ratio for lower induced drag.