They demanded to withdraw old troops Basic rules to be followed for A
Right Answer is: D
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 active form of simple past tense. The structures for active/passive voices are:
Active: Subject + verb (IInd form) + object…
Passive: Object + was/were + verb (IIIrd form) + by + subject…
In this construction the object of the infinitive in the active voice is taken as subject of the sentence in the passive and the verb of the active remains the same, only infinitive is made into passive.
The structure with demand + infinitive is usually expressed in the passive by verb + that – should + passive infinitive. Option D is the correct answer.