During cellular respiration, organic molecules, such as glucose, are converted into Adenosine Triphosphate which can be used by the organism, so I believe the best answer would be the third option.
Of all the choices given this is not a function of the CSF:
- CSF helps to promote mitosis within nueronal tissues.
All the other choices support the correct function and physiology of the CSF within the brain. This clear, colorless bodily fluid supports the brain and its functions.