Stress is a natural reaction that is characterized by physical and emotional tension caused by different situations that trigger a generalized feeling of anxiety or frustration. Stress can cause physical and emotional symptoms such as diarrhea, constipation or slow digestion, poor memory, lack of energy or concentration, general muscle tension, and increased heart rate. This means the one that is not a response to stress is decreased muscle tension because when we experience stress muscle tense up, which is a natural reaction that makes you alert and ready to scape or face some challenging difficult situation. So, the correct answer is C. Decreased muscle tension
