The phasor diagrams on the right represent three oscillating emfs having different amplitudes and frequencies at a certain instant of time t = 0. As t increases, each phasor rotates counterclockwise and completely determines a sinusoidal oscillation. At the instant of time shown, the magnitude of associated with each phasor given in ascending order by diagrams is (A) a, b, c: (B) b, c, a: (C) a, c, b: (D) c, b, a: (E) need more information.