During anaerobic cellular respiration in skeletal muscles, pyruvic acid produced by is converted into

During anaerobic cellular respiration in skeletal muscles, pyruvic acid produced by glycolysis is converted into lactic acid.

The glycolysis is the process by which one molecule of glucose is converted into two molecules of pyruvate.

During anaerobic respiration in muscles (such as occurred during exercise) the lactic acid fermentation takes place by which the pyruvate is converted into the lactic acid. The reaction is catalyzed by the enzyme lactic acid dehydrogenase.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.