Select the correct passive form of the given sentence.

The government is distributing free food grains among the poor.

Free food grains are being distributed among the poor by the government.

The correct passive form of the given sentence is Free food grains are being distributed among the poor by the government.

The active voice is formed by putting the subject of the sentence before the verb and the past participle of the main verb. In this case, the subject of the sentence is "the government" and the main verb is "distribute." The past participle of "distribute" is "distributed." So, the active form of the sentence is "The government is distributing free food grains among the poor."

The passive voice 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 "free food grains" and the main verb is "distribute." The past participle of "distribute" is "distributed." So, the passive form of the sentence is "Free food grains are being distributed among the poor by the government."

The other options are incorrect because:

• Free food grains have been distributed among the poor by the government is in the past perfect tense, while the original sentence is in the present tense.
• Free food grains were distributed among the poor by the government is in the past tense, while the original sentence is in the present tense.
• Free food grains are distributed among the poor by the government is in the active voice, while the question asks for the passive voice.