Who taught her such things?
A
Who was she taught such things by?
B
She was taught such things by who?
C
By whom she was taught such things?
D
By whom was she taught such things?
Correct Answer: By whom was she taught such things?
By whom was she taught such things?Given sentence is in simple past tense and it is in active voice.
Rule :
Subject + (was / were) + V3 + Optional Agents.