14:I[5014,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"default"] 15:I[38392,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"PracticeCard"] 17:I[70570,["/_next/static/chunks/11d1gk4m2o846.js","/_next/static/chunks/14mrh2-p_w84d.js","/_next/static/chunks/40y9lkvta2o_p.js"],"ExamAppearanceBadge"] 16:T5b5,

The correct answer is - ঘ) The work had been completed by him.

Past Perfect Tense-এর Active থেকে Passive Voice করার নিয়ম
Active Voice-এর Object কে Passive Voice-এ Subject হিসেবে বসে।
এর পরে had been বসবে।
তারপর মূল verb-এর Past Participle হবে।
এরপর by বসে।
সবশেষে Active Voice-এর Subject কে Objective form-এ বসাতে হবে।

Structure (Passive Voice):
Object (Subjective form) + had been + Past Participle of Main Verb + by + Subject (Objective form)

Examples:
Active: I had written the letter.
Passive: The letter had been written by me.

Active: We had dug the canal.
Passive: The canal had been dug by us.

Other options

ক) The work had completed by him.
এখানে had completed passive ভুল ফর্ম; “been” প্রয়োজন।

খ) The work had been complete by him.
এখানে complete adjective আকারে আছে; past participle (completed) প্রয়োজন।

গ) The work had been completing by him.
এখানে completing continuous form, যা passive এ ব্যবহার হয় না।