In taking a social history, you find that a client with a Masters degree in Business Administration ...

In taking a social history, you find that a client with a Masters degree
  in Business Administration has worked in four jobs during the last two
  years as an administrative assistant. He indicated that in all cases he
  left for a better opportunity.
 
  Based on this information, you determine
  that ________.
  A. his erratic employment in a position for which his education
  overqualifies him proves he has a substance use disorder.
  B. he is not being completely honest about his employment history
  or his substance abuse.
  C. he is not able to find work more suited to his education level or
  he prefers this kind of work, but substance abuse is not an
  apparent problem.
  D. you need to explore further why he has experienced erratic
  employment in a position for which his education overqualifies
  him.