Oliver has been charged with murder. Oliver, who has a psychiatric history, doesn't seem to ...

Oliver has been charged with murder. Oliver, who has a psychiatric history, doesn't seem to understand the charge against him. He hasn't answered any of the questions that his lawyer has asked him so he hasn't been assisting with his defense. Although his IQ has been tested and found to be in the low normal range, he doesn't seem to understand that if he pleads guilty, he is going to go to prison. Which of the following is the crucial issue that will determine whether or not Oliver is judged as incompetent?
 
  A. his psychiatric history
  B. his inability to participate knowingly and meaningfully in the proceedings
  C. his inability to work with defense counsel
  D. both B and C