What Are Drugs Such as a Benzodiazepine or Antidiarreheal Medication

What are drugs such as a benzodiazepine or antidiarreheal medication used for during treatment for opioid addiction?

A) To reduce the withdrawal effects from opioid use.
B) To reduce the reinforcing effects of opioids.
C) To prevent the use of alternative addictive substance.
D) To provide low-cost, safer alternatives for opioid use.