The conclusion to be drawn from the man named shereshevskii whose abnormal brain functioning gave him virtually limitless word-for-word memory is that having memory like a video recorder.
a. him draw powerful inferences and intelligent conclusions from his vast knowledge base.
b. is an advantage because it eliminates "selective" recording (remembering some events and forgetting others), which provides no useful service to humans.
c. is largely a blessing because no event would be erased.
d. can seriously disrupt functioning in one's personal life.