What Was the Logic Behind the First Split-Brain Operations That

What was the logic behind the first split-brain operations that were tried experimentally with humans?

A) By removing the precise brain location where epileptic seizures originated, the seizures should stop.
B) By selectively removing portions of the left hemisphere, language functions should shift to the right hemisphere.
C) By cutting the corpus callosum, seizure activity should be contained in just one hemisphere of the brain
D) By cutting the corpus callosum, the brain would be forced to use the left and right hemispheres for different functions.