.Who taught you grammar ? (Change into passive)

Options

A. By whom you were taught grammar?
B. By whom were you taught grammar?
C. By whom was grammar you taught?
D. By whom were grammar taught to you ?

Answer

B

Explanation

By whom were you taught grammar ? (Passive)
The sentence is in Simple Past Tense. (Active)
who in Active form becomes by whom in the Passive.