Doctors Know That the Hippocampus Is Part of the Limbic

Doctors know that the hippocampus is part of the limbic system and is central in the acquisition and consolidation of new information in memory.But in the case of Henry Molaison,this part of the brain was surgically removed to control his epileptic seizures.His seizures stopped but he was unable to form new memories in his brain.Then why did the doctors remove this important part of the brain in 1953,the year of Henry's brain surgery?

A) This was the only part of the brain that could be easily operated upon.
B) Doctors had to choose between stopping his seizures or losing his memory to save his life.
C) The purpose of the hippocampus was not known to the doctors in the 1950s.
D) None of the above