**Core Concept**
The man's experience is a classic example of a phenomenon where a person perceives a deceased loved one as being alive, which is a common manifestation of grief in the bereaved individual. This is closely related to the concept of hallucinations, particularly auditory and visual hallucinations, which can occur in various psychiatric and medical conditions.

**Why the Correct Answer is Right**
The correct answer is **c) Bereavement reaction**. This is because the man's experience is a classic example of a bereavement reaction, which is a normal response to the loss of a loved one. The experience of seeing or hearing a deceased loved one is a common phenomenon, especially in the first few months after the loss. This is often referred to as a "pseudohallucination" or a "coenaesthesis" where the individual perceives a sensory experience without any external stimulus. In this case, the man's experience is likely a result of his grief and emotional distress, rather than any actual supernatural phenomenon.

**Why Each Wrong Option is Incorrect**
**Option A:** Normal grief - While grief is a normal response to loss, it is not a specific diagnosis that can account for the man's experience of seeing his wife.

**Option B:** Grief psychosis - Grief psychosis is a rare condition where a person experiences a psychotic break in response to a significant loss, often accompanied by hallucinations and delusions. However, the man's experience is not indicative of a psychotic break.

**Option D:** Supernatural phenomenon - While the man's experience may seem supernatural, it is more likely a manifestation of his grief and emotional distress rather than any actual supernatural event.

**Clinical Pearl / High-Yield Fact**
It is essential to differentiate between normal grief and pathological grief reactions, such as grief psychosis, which may require medical attention. A thorough assessment of the individual's mental health and emotional state is crucial in determining the underlying cause of their experience.

**Correct Answer: C. Bereavement reaction**