What would happen if you lacked cerebrospinal fluid?

A. The brain cells would be in contact with the skull, which would cause significant damage.
B. The cells of the brain and spinal cord would have no access to extracellular water.
C. Without it, the weight of your brain would push against the bottom of your skull.
D. It provides the same function as plasma with similar protein and ion levels, so plasma would be able to supplement its function.