What was the researchers finding in a study comparing brain activity in murderers who had ...

What was the researchers finding in a study comparing brain activity in murderers who had experienced neglect and abuse to murderers who had not experienced neglect or abuse (Raine, Stoddard, Bihrle & Buchsbaum, 1998)?
 
  a. The brain activity of the neglected and abused murderers was quite similar to the nonabused murderers.
  b. The brain activity of the neglected and abused murderers was quite similar to the nonviolent control participants.
  c. The brain activity of the nonabused murderers was quite similar to the nonviolent control participants.
  d. The brain activity of the three groupsneglected and abused murderers, nonabused murderers, and nonviolent controlswas dissimilar.