Select the correct passive form of the given sentence.

The PM has announced a very large economic relief package for the country.

A very large economic relief package for the country has been announced by the PM.

The correct passive form of the given sentence is A very large economic relief package for the country has been announced by the PM.

The sentence "The PM has announced a very large economic relief package for the country" is in the active voice, with the subject "The PM" and the verb "has announced." 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 "a very large economic relief package for the country" and the main verb is "announce." The past participle of "announce" is "announced." So, the passive form of the sentence is A very large economic relief package for the country has been announced by the PM.

The other options are incorrect because:

• A very large economic relief package for the country is going to be announced by the PM. is in the future tense, while the original sentence is in the present tense.
• A very large economic relief package for the PM has been announced by the country. is grammatically incorrect. The subject of the sentence is "a very large economic relief package for the country," but the verb "has been announced" is followed by the pronoun "the PM."
• A very large economic relief package for the country was announced by the PM. is in the past tense, while the original sentence is in the present tense.