Can someone explain how C Is correct this diagram.. Like how is bicarbonate low?

Let's see what makes the amount of Bi-carbonate ion low in X!

━━━━━━━━━━━━━━━━

The question is a bit tricky so read the below points carefully.

━━━━━━━━━━━━━━━━

This is what happens inside the Red blood cells:-

Reaction :

━━━━━━━━━━━━━

━━━━━━━━━━━━━━━━

Thus the PCO2 is high though the amount of Bi-carbonate ion is low in X!

the correct answer in apex is tissue development, i know because i just had this question

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.