The correct answer to this question is D, Whisper, slap, smack I hear in the lunchroom. Onomatopoeia is words that express sounds we can hear all around us. A famous example of onomatopoeia is with the word buzz. This word helps explain the sound that bees make.
Another example is the word shh, which is used to silence someone. In the sentence provided, whisper, slap, and smack are all sounds that we can hear, which is why they are examples of onomatopoeia. Though the other examples include actions, none of them include words that would be related to sound.