The correct answer is 3124.
The first word is “bag”. This is a noun that refers to a container for carrying things.
The second word is “is”. This is a verb that indicates existence or presence.
The third word is “whose”. This is a pronoun that asks or indicates the ownership of something.
The fourth word is “this”. This is a pronoun that refers to something that is close at hand or being discussed.
The correct order of the words is 3124. This is because the word “whose” comes after the word “bag” because it is asking about the ownership of the bag. The word “is” comes after the word “whose” because it is indicating that the bag belongs to someone. The word “this” comes last because it refers to the bag that is being discussed.
The other options are incorrect because they do not follow the correct order of the words. Option A, 2413, is incorrect because the word “is” comes before the word “whose”. Option B, 4231, is incorrect because the word “whose” comes after the word “is”. Option C, 3214, is incorrect because the word “is” comes after the word “this”.