What does the speaker mean by 'mind begins a journey'?

What does the speaker mean by 'mind begins a journey'?

• A. Even though his body is lying down, his thoughts travel to the person he loves.
• B. The mind physically leaves the body and travels to a distant land.
• C. The mind stops thinking and enters sleep.
• D. The mind goes on a journey to find food.

Answer: (A)