Select the correct passive voice of the given sentence.

Hold the rope firmly.

Let the rope be held firmly.

The correct passive voice of the given sentence Hold the rope firmly is Let the rope be held firmly.

The active voice of the sentence is Hold the rope firmly. This sentence is in the imperative mood, which is used to give commands or instructions. The passive voice of the sentence is formed by putting the verb "to be" and the past participle of the main verb after the word "let." In this case, the main verb is "hold." The past participle of "hold" is "held." So, the passive form of the sentence is Let the rope be held firmly.

The other options are incorrect because:

• Let the rope hold you firmly. This sentence is in the active voice, not the passive voice.
• Let the rope firmly hold you. This sentence is grammatically incorrect. The word "firmly" should be placed after the verb "hold."
• Let the rope be hold firmly. This sentence is grammatically incorrect. The verb "to be" should be followed by the past participle of the main verb, which is "held."