Correct answer: (B) higher than terminal voltage Vt
Explanation
A synchronous motor with leading armature current is overexcited. In the usual negligible-armature-resistance model, $E_f=V_t-jX_sI$.
For current leading Vt by φ>0, the real component of Ef becomes $V_t+X_sI\sin\phi$, already greater than Vt. Its magnitude is therefore also greater. Thus the intended comparison is **$E_f>V_t$, B**.
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