Final answer:
Without specific context from the teaching material, the correct answer to why the teacher didn't punish the speaker and his friend cannot be determined. However, an explanation of passive voice, where the subject is acted upon rather than performing the action, is provided to understand the concept better.
Step-by-step explanation:
The question posed revolves around why the teacher did not punish the speaker and his friend Nikhs, mentioned in a lesson on Passive Voice. In order to appropriately address the question, the correct answer should be provided based on the context provided by the teaching material; this context, however, is not provided in the question, thus an assumption has to be made. Among the given options, without specific context given, the correct answer cannot be definitively determined. However, we can explore the use of passive voice to understand how it is relevant to the question.
Passive voice in English grammar occurs when the subject of a sentence is acted upon by the verb. An example in passive voice would be 'The paper was written by the student,' as opposed to the active voice version, 'The student wrote the paper.' In this sentence, the subject, which is the paper, is not performing the action but rather receiving it. Passive voice is often utilized when the subject being acted upon is more important, or when the performer of the action is unknown or irrelevant.