Muscle fatigue occurs due to the accumulation of
(a)Pyruvic acid
(c)Lactic acid
(d)Eroman ${ CO }_{ 2 }$

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Hint It had been a build-up that was the explanation for muscle fatigue. The idea had a "pickling" effect on muscles, which inhibits their ability to contract. In spite of the fact that the effect of this on performance is currently unsure, it will help or impede muscle weariness.

Complete answer
The cytoplasm becomes acidic thereby enzyme activity stops and food is not oxidized and as the energy is not available due to deposition of lactic acid during muscle fatigue and contraction of the muscle it also stops.
Muscle fatigue is the decline inability of a muscle to get the force. It is often a result of vigorous exercise but abnormal fatigue could also be caused by barriers to or interference with the various stages of contraction. There are two fundamental causes of muscle weakness: the limitations of a nerve's capacity to get a continued sign (neural exhaustion); and hence the diminished capacity of the muscle cell to contract (metabolic weariness).

Additional information
Fatigue has been found to play an enormous role in limiting performance in only about every individual in every sport. In the research field, members were found to bring up decreased willful power creation in exhausted muscles (estimated with concentric, flighty, and isometric withdrawals), vertical hop statues, other field tests of lower body power, reduced throwing velocities, reduced kicking power, and velocity, less accuracy in throwing and shooting activities, endurance capacity, anaerobic capacity, anaerobic power, mental concentration, and lots of other performance parameters when sport-specific skills are examined.

So the correct answer is ‘Lactic acid’.

Note: Muscle fatigue may be due to precise molecular changes that occur in vivo with sustained exercise. It's been discovered that the ryanodine receptor present in striated muscle goes through a conformational change during exercise, prompting "cracked" diverts that are inadequate in calcium discharge. These "leaky" channels could also be a contributor to muscle fatigue and decreased exercise capacity.