In the Past 20 Years or So, How Has the Authority

In the past 20 years or so, how has the authority of psychologists and psychiatrists to make decisions about things such as admitting patients and prescribing medication changed?

A) Psychiatrists have been granted some authority previously held only by psychologists.
B) Both psychiatrists and psychologists have been granted some authority previously held only by the other.
C) Psychologists have been granted some authority previously held only by psychiatrists.
D) Psychiatrist/psychologist authority has remained unchanged.