Identify the correct Passive Voice form of the following sentence:

The chief minister inaugurated the Auto Expo last week.

The Auto Expo was inaugurated by the chief minister last week.

The correct answer is Option (3) → The Auto Expo was inaugurated by the chief minister last week.

Here's why:

• The chief minister did not inaugurate the Auto Expo last week. - This sentence contradicts the original statement and is not in the passive voice.
• The Auto Expo was inaugurated last week. - This is grammatically correct but lacks the information about who performed the inauguration.
• Who had inaugurated the Auto Expo last week? - This is a question, not a passive voice statement.
• The Auto Expo was inaugurated by the chief minister last week. - This sentence accurately converts the active voice structure to passive voice. The subject ("The chief minister") becomes the agent introduced by "by," the verb ("inaugurated") changes to its past participle ("inaugurated"), and the original time frame ("last week") is retained.

Therefore, the only option that accurately represents the passive voice of the original sentence while maintaining the essential information is "The Auto Expo was inaugurated by the chief minister last week."