You must look into this matter.

Solution (By Examveda Team)

The question is: You must look into this matter. We need to change this from active voice to passive voice.
Let's break down the sentence:
* You (subject)
* must look into (verb - notice 'must' indicates obligation or advice)
* this matter (object)
In passive voice, the object becomes the subject. Also, we need to keep the meaning of "must" (obligation).
Let's look at the options:
Option A: This matter has been looked into by you.
This uses "has been," which changes the meaning from "must." So, this is incorrect.
Option B: This matter may be looked into by you.
This uses "may," which changes the meaning from "must." So, this is incorrect. "May" shows possibility, not obligation.
Option C: This matter should be looked into by you.
"Should" is the passive form of "must" and more appropriately carries the sense of obligation or necessity. The structure is correct: Object becomes subject ("This matter"), "must look into" becomes "should be looked into", and the original subject "you" can be included with "by you". Therefore, this answer choice is correct
Option D: This matter into looked by you.
This is grammatically incorrect and doesn't make sense. The word order is wrong.
Therefore, the correct answer is Option C: This matter should be looked into by you.
Key takeaway: When changing voice, identify the subject, verb, and object. Understand how modal verbs like "must", "can", "should" transform in passive voice. And always double-check for grammatical correctness!