Choose the correct active construction(s) of the given sentence:The w…

The correct answer is Option (3) → (B) and (D) only

Active form of a simple past passive:

Change	Passive	Active	Why
Doer becomes subject	by the music teacher	The music teacher	The music teacher does the composing, so the teacher becomes the subject.
Subject becomes object	the welcome song for Teachers’ Day	the welcome song (after the verb)	The song receives the action, so it goes after the verb.
Tense kept	was composed	composed	“Was composed” is in the simple past, so the active stays in the simple past. “Was” goes, and “composed” stays as the past form.
Full sentence	The welcome song for Teachers’ Day was composed by the music teacher.	(B) The music teacher composed the welcome song for Teachers’ Day. (D) For Teachers’ Day, the music teacher composed the welcome song.

Other simple past passives change back the same way: was / were + past participle (V3) → the past form of the verb. Example: The tiffin boxes were packed by Amma. → Amma packed the tiffin boxes.

(A) The music teacher has composed the welcome song for Teachers’ Day. — Incorrect.

• “Has composed” is the present perfect.
• The passive “was composed” is the simple past.
• Correct form: The music teacher composed the welcome song for Teachers’ Day.

(B) The music teacher composed the welcome song for Teachers’ Day. — Correct.

• The doer is the subject and “composed” keeps the simple past.

(C) The music teacher was composing the welcome song for Teachers’ Day. — Incorrect.

• “Was composing” is the past continuous.
• The passive for that would be “was being composed”.
• Correct form: The music teacher composed the welcome song for Teachers’ Day.

(D) For Teachers’ Day, the music teacher composed the welcome song. — Correct.

• Only the place of “for Teachers’ Day” changes.
• “Composed” is right.