Point Out Biological Problems Would Be Difficult to Solve If

Point out biological problems would be difficult to solve if the "brain-in-a-vat" experiment were ever tried in real life. Some of these would include:

A) how to provide oxygen and glucose to brain tissues
B) how to drain this fluid in a manner that doesn't expose the brain to toxins or pathogens
C) how to keep neurons from dividing
D) a and b only
E) all of the above