Unlike psychiatrists, who are trained as medical doctors, [u]psychologists have historically been forbidden from prescribing their patients drugs, but in 2002 New Mexico began to grant the privilege of prescribing[/u] to licensed, doctoral level psychologists who complete an additional training and certification program.
A. psychologists have historically been forbidden from prescribing their patients drugs, but in 2002 New Mexico began to grant the privilege of prescribing
B. psychologists have historically been forbidden to prescribe drugs for their patients, but in 2002 New Mexico began granting prescribing privileges
C. psychologists have historically been forbidden to prescribe their patients drugs, but in 2002 in New Mexico, the privilege to prescribe began to be granted
D. historically psychologists have been forbidden from prescribing their patients drugs, but in 2002 New Mexico began to grant the privilege of prescribing
E. historically psychologists have been forbidden from prescribing drugs for their patients, but in 2002 in New Mexico, they began granting prescribing privileges
I agree with the answer and zeroed in on correct answer. However, my question is what are correct usage of "forbidden from" and "forbidden to do".