Fatigue is the most common symptom of overtraining. Thus, the correct option is D.
What is Overtraining?
Overtraining may be defined as a situation when an athlete ignores the signs of overreaching and continues to train and exceeds their body's ability to recover from strenuous exercise.
When you do overtrain beyond your body's ability, you will definitely feel the symptoms like fatigue, loss of appetite, etc.
Therefore, the correct option is D.
To learn more about Fatigue, refer to the link:
https://brainly.com/question/948124
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