A nurse worked at Community Hospital for several months, then resigned and took a position at ...

A nurse worked at Community Hospital for several months, then resigned and took a position at
  General Hospital. At General he was seen as a super nurse and given increasing responsibility.
 
  He
  often volunteered or arranged with others to be assigned as medication nurse. After a year, he began
  to call in sick frequently and was noticed to be more irritable and unsociable. Then he made several
  serious medication errors in rapid succession. As these were investigated, it was learned that he had
  been allowed to resign from Community Hospital when he was found diverting client narcotics for
  his own use. One evening shortly after the investigation began, the nurse was found unconscious in
  the locker room. The nurse manager retrospectively identified an early indicator of the nurse's drug
  use as
  a. assuming responsibility for errors.
  b. high sociability with peers during the shift.
  c. seeking to be in possession of the narcotic keys.
  d. presenting a neat physical appearance.