Correct Answer: Option D

Explanation

A total of 18 molecules of oxygen (O\(_2\)) are required for the aerobic respiration of three molecules of glucose. According to the balanced equation for cellular respiration,  C\(_6\)H\(_{12}\)O\(_6\)  + 6O\(_2\)  →  6CO\(_2\)  +  6H\(_2\)O,

1 molecule of glucose requires 6 molecules of oxygen. Therefore, for three molecules of glucose, 3 x 6 = 18 molecules of oxygen are needed.

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