Select the correct passive form of the given sentence.

Fortunately, the fire did not cause much damage.

Fortunately, not much damage was caused by the fire

The correct passive form of the given sentence is Fortunately, not much damage was caused by the fire.

The active voice of the sentence is Fortunately, the fire did not cause much damage. This sentence is in the simple past tense, which is used to describe an action that happened in the past. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "the fire" and the main verb is "cause." The past participle of "cause" is "caused." So, the passive form of the sentence is Fortunately, not much damage was caused by the fire.

The other options are incorrect because:

• Fortunately, not much damage is caused by the fire. is in the present tense, while the original sentence is in the simple past tense.
• Fortunately, not much damage is being caused by the fire. is in the present progressive tense, which is used to describe an action that is happening now. The action of causing damage by the fire is not something that is happening now.
• Fortunately, not much damage was being caused by the fire. is also in the present progressive tense.