In an $A.C.$ circuit,the instantaneous current and $E.M.F.$ are represented as $i = i_0 \sin(\omega t - \frac{\pi}{6})$ and $E = E_0 \sin(\omega t + \frac{\pi}{3})$ respectively. The voltage leads the current by
- A$\frac{\pi}{2}$
- B$\frac{\pi}{4}$
- C$\frac{\pi}{3}$
- D$\frac{\pi}{6}$
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