Why was she deprived of truth? Basic rules to be followed for Active/

SOLUTION

Basic rules to be followed for Active/Passive conversions are:

1. The object of the active verb becomes the subject of the passive verb.

2. The finite form of the verb is changed (to be+ past participle).

3. The subject of the active sentence becomes the object of the passive sentence (or is dropped).

4. Preposition ‘by’ is used before object.

The given sentence is in passive form of past interrogative tense. The structures for active/passive voices are:
Active: Did + Subject + verb (Ist form) + object…
Passive: Was/Were + Object + verb (IIIrd form) + by + subject…
Question is in passive voice in interrogative form so the answer will be in active voice past indefinite in interrogative form. Structure will be : Why + did+sub. + V1(as it is an interrogative sentence) + obj. + rest part of sentence. Hence option A is correct answer.