Select the one which expresses the same sentence in the passive voice. Rachna…

Correct passive sentence: Dinner was being cooked by Rachna for the guests.

Why this is correct:

• It preserves the past continuous aspect: active "was cooking" becomes passive "was being" + past participle (was being cooked).

• The subject and object are swapped correctly: the original object "dinner" becomes the subject, and "Rachna" becomes the agent introduced by "by".

• The prepositional phrase "for the guests" remains with the verb phrase, keeping the original meaning.

Why the other choices are incorrect:

• “Dinner was cooked by Rachna for the guests.” — This is simple past passive and suggests a completed action, not the ongoing action expressed by the original past continuous.

• “Dinner had been cooked by Rachna for the guests.” — This is past perfect passive, indicating the action was completed before another past event; it does not match the original continuous tense.

• “For the guests dinner was being cooked by Rachna.” — Fronting the phrase "for the guests" is grammatically possible but changes emphasis and is less natural than keeping "Dinner" as the subject. The preferred passive keeps the subject-first order: "Dinner was being cooked by Rachna for the guests."