Physiological fatigue occurs because of the following –

Correct option is B

Physiological fatigue is primarily caused by lactic acid accumulation in muscles during intense physical activity. It results from anaerobic respiration when oxygen supply is insufficient to meet the demand.
Information Booster: Lactic acid accumulation lowers the pH of muscles, causing discomfort and reducing muscle efficiency. Adequate rest and hydration help mitigate this condition.
Additional Knowledge:
· Boredom (a) & Frustration (c): Linked to psychological fatigue, not physiological.
· Lack of skill (d): Relates to inefficiency but is not a direct cause of physiological fatigue.