Change the voice of the following sentence from active to passive: "I…

The correct answer is Option (4) → The window was opened by me.

Active to passive (simple past):

Change	Active	Passive	Why
Object becomes subject	the window	The window	The object, “the window”, becomes the subject.
Tense kept	opened	was opened	The simple past “opened” becomes was + past participle: “was opened”.
Agent (by ...)	I	by me	The doer moves to a by-phrase, and the pronoun takes its object form: “I” becomes “by me”.
Full sentence	I opened the window.	The window was opened by me.

Example: She wrote the letter. → The letter was written by her.

Why the Other Options are Incorrect?

Option 1: I was the one who opened option the window — Incorrect. It is still an active sentence with "I" as the doer, and it carries a stray word, "option".

Option 2: The window was opened and I did it. — Incorrect. It splits the idea into two clauses instead of using the by-phrase. The second clause is active again.

Option 3: The window was by I. — Incorrect.

• The past participle opened is missing.
• After "by" the pronoun must be me, not "I".