Which statement about relaxation and inhalation-to-exhalation ratio is true?

• A. Inhalation-to-exhalation ratio increases with relaxation.
• B. Inhalation-to-exhalation ratio decreases with relaxation; increases with stress.
• C. Inhalation-to-exhalation ratio is unaffected by relaxation.
• D. Inhalation-to-exhalation ratio becomes unpredictable with stress.

Answer: (B)