Correct Answer: If we have to maintain our liberty, then we must fight for it.

Solution : The correct choice is the second option.

Active voice emphasises the doer of the action, while passive voice emphasises the receiver. To convert passive to active, we make the subject perform the action and rephrase the verb.

The active voice sentence follows the structure: "subject + verb + object" .

Here, in the active voice, the subject "we" is explicitly mentioned as the one who has to maintain liberty, and the action is framed as "we must fight for it". This makes the sentence clearer and more direct in conveying the idea of taking action to preserve liberty.

Therefore, the correct answer would be: "If we have to maintain our liberty, then we must fight for it."