Correct option is B
The correct active form of the given sentence is (b) We object to this unfair proposal.
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Active Voice- Active voice is a grammatical structure in which the subject of the sentence performs the action expressed by the verb.
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Passive Voice- Passive voice refers to a grammatical construction where the subject of a sentence undergoes an action rather than performing it. In passive voice sentences, the emphasis is on the recipient or object of the action.
Conversion rule:
Subject + verb + object -> <- Object + auxiliary verb (is, am, are) + past participle + by + subject.
The active voice equivalent should maintain the present tense and use the correct preposition 'to' after the verb 'object.'