Correct option is C
The correct active form of the sentence is "We hold all meetings in the conference room."
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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.
This maintains the present simple tense and active voice of the original sentence.