Active-to-passive voice transformation (interrogative, present continuous) Original sentence: Who is creating this mess? Choose the correctly formed passive-voice question with proper auxiliary order.

Concept/Approach
Present continuous passive: "is being created". In questions, use subject–auxiliary inversion: "By whom is ... being ...?"

Evaluation of options
Correct: "By whom is this mess being created?" (proper inversion and aspect).(a) Wrong tense/aspect ("has been") and word order.(b) Present perfect passive, not present continuous.(c) Missing inversion ("By whom this mess is ...").

Final Answer
By whom is this mess being created?