Although Naltrexone Has Been Used to Treat Alcohol Use Disorder,it

Although naltrexone has been used to treat alcohol use disorder,it

A) is an opioid antagonist,and it is not clear how it works with alcohol users.
B) has never received any research support for this type of use.
C) is not available for prescription in the U.S.
D) is dangerous because people become deathly ill if they drink alcohol while taking it.