Which phrase best describes the effectiveness of detoxification services from a purely medical ...

Which phrase best describes the effectiveness of detoxification
  services from a purely medical standpoint?
 
  A. Hospital/nonhospital inpatient settings are successful; for
  someone with moderate alcohol withdrawal symptoms,
  outpatient can be successful
  B. Hospital/nonhospital inpatient settings are successful; for
  someone with severe alcohol withdrawal symptoms, outpatient
  can be successful
  C. Hospital/nonhospital inpatient settings are not very successful;
  for someone with mild alcohol withdrawal symptoms, outpatient
  is most successful
  D. Hospital and nonhospital inpatient settings are successful; for
  homeless, outpatient is most successful