The engineers will be inspecting the building. (Make it passive)

• Correct Answer: ক) The building will be being inspected by the engineers.

Active: The engineers will be inspecting the building.
Passive: The building will be being inspected by the engineers.

• Future Continuous Tense-যুক্ত Active Voice-কে Passive Voice-এ রূপান্তরের নিয়ম:
Active voice-এর object-কে passive voice-এর subject হিসেবে বসাতে হয়।
এরপর shall be being/will be being বসে।
মূল verb-এর past participle form বসাতে হয়।
এরপর by বসে।
সবশেষে active voice-এর subject-এর objective form বসে।

Structure: Object + shall/will + be being + past participle form of verb + by + subject-এর objective form.

• Other Options:
খ) The building will be inspected by the engineers.
- এটি Future Indefinite Tense-এর passive structure.

গ) The building is being inspected by the engineers.
- এটি Present Continuous Tense-এর passive structure.

ঘ) The building will be inspecting by the engineers.
- passive voice-এ মূল verb-এর present participle inspecting নয়, past participle inspected বসবে। be being বসবে।

Source:
Advanced Learner’s Communicative English Grammar & Composition by Chowdhury & Hossain.
Website English Wizard by Saleh Ahmed.