Change the following sentence from Active Voice to Passive Voice.
They will start the fireworks after midnight.

Correct option is B

Correct passive voice: (b) The fireworks will be started by them after midnight.
Definition (Active Voice):
• Active Voice → The subject does the action. (Hindi: कर्ता कार्य करता है)
• Example: They will start the fireworks.
Definition (Passive Voice):
• Passive Voice → The subject receives the action (object of active becomes subject). (Hindi: कर्म पर क्रिया होती है)
• Example: The fireworks will be started (by them).
Step-by-step conversion (in detail):
• Active sentence parts: They (Subject) + will start (Simple Future) + the fireworks (Object) + after midnight (time phrase)
• Make the object the new subject: the fireworks
• Identify tense: will + V¹ = Simple Future
• Simple Future Passive structure: will be + V³
• start (V¹) → started (V³)
• Add agent with by: by them (optional in meaning, but kept in exam-standard conversion)
• Keep time phrase at the end: after midnight
Grammatical rule (English):
• Active: S + will + V¹ + O
• Passive: O + will be + V³ + by + S
व्याकरणिक नियम (Hindi):
• Future passive की रचना: Object + will be + V³ + by + Subject।
Why other options are incorrect:
• (a) “are going to be started” → tense/style changed (will → going to).
• (c) agent missing; also word order is less standard for direct conversion.
• (d) “starting of…” awkward and not the correct passive transformation style for exams.
Hence, option (b) is the correct answer.