Respuesta :
John is experiencing hallucinations when he heards a voice around him narrating his own every action while grocery shopping.
Hallucinations
Hallucinations are simply imaginations created by mind. They are sensory experiences that appears to us to be real but is actually created by the mind.
In the context, John is hallucinating that he heards voices which narrates his every action while doing somethings.
It is nothing but his imaginations in his mind which appears to be real.
Learn more about "hallucination" here :
https://brainly.com/question/7433010
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