Choose the appropriate Active sentence from the following: The assign…

The correct answer is Option (2) → They needed to submit the assignment.

Making the sentence active:

Change	Passive	Active	Why
Agent (by ...) becomes subject	– (no doer)	They	“The assignment needed submission” names no doer, so the active form must supply a doer (“they”) as the subject.
Subject becomes object	The assignment (subject)	the assignment (object)	“The assignment” receives the action, so in the active form it becomes the object.
Verb	needed submission	needed to submit	The noun “submission” becomes the verb: “needed submission” becomes “needed to submit”.
Full sentence	The assignment needed submission.	They needed to submit the assignment.

Tense kept: the tense stays simple past ("needed"), and the meaning stays the same.

Example: The car needed repair. → They needed to repair the car.

Why the Other Options are Incorrect?

Option 1: They had to submit the assignment. — Incorrect. "Had to" expresses an obligation imposed on them. It changes the verb "needed" of the given sentence.

Option 3: They need submitting the assignment. — Incorrect.

• The tense changes from past to present.
• "Need submitting" is a passive sense (it needs to be submitted) and cannot take "they" as the doer.

Option 4: The assignment needed to be submitted by them. — Incorrect. "To be submitted by them" is the passive form, not the active.