Choose the option that is the passive form of the sentence.

The Municipal Corporation changed the manhole covers before the rainy season.

The manhole covers were changed before the rainy season.

The correct option that is the passive form of the sentence is The manhole covers were changed before the rainy season.

The other options are incorrect because:

• The manhole covers are change before the rainy season is grammatically incorrect. The verb "to change" is followed by a direct object, but the phrase "are change" is not a direct object.
• The manhole covers is being changed before the rainy season is in the present progressive tense, while the original sentence is in the simple past tense.
• The manhole covers can be changed before the rainy season is in the modal mood, while the question asks for the passive voice.