Correct Answer: Who pushed you into the mud?

Solution : The correct choice is the first option.

Active voice emphasises the doer of the action, while possessive voice emphasises the receiver. To convert passive to active, we make the subject perform the action and rephrase the verb.

Here, "by whom" is changed to "who". (object becomes subject)

The structure of the active sentence in the case of the interrogative sentence is: "Who + past form of the main verb + subject + prepositional phrase?"

So, the correct sentence would be: "Who pushed you into the mud?"