Unlike psychiatrists, who are trained as medical doctors,
psychologists have historically been forbidden from prescribing their patient drugs, but in 2002 New Mexico began to grant the privilege of prescribing to licensed, doctoral level psychologists who complete an additional training and certification program.
Option Elimination -
A. psychologists have historically been forbidden from prescribing their patients drugs, but in 2002 New Mexico began to grant the privilege of prescribing -
First, "forbidden to" and "forbidden from" are acceptable usages. But they have a different purpose.
1. "Forbidden to" indicates when someone is not allowed to do something. The key is that it emphasizes the prohibition or restriction on the PERSON. E.g., He is forbidden to enter the premises.
2. "Forbidden from" is used when emphasizing the ACTION. He is forbidden from leaving the country. Here, the focus is on the action of "leaving the country."
In the question at hand, the focus is on the PERSON: the comparison first starts with the "unlike" comparison marker between "psychiatrists" and "psychologists." We are now talking more about "psychologists." Thus, to emphasize the PERSON, we need "forbidden to." Moreover, "prescribing their patient's drugs" is quite weird. We normally say, "The doctor prescribed antibiotics for the patient's infection." So the doctor prescribed what? Antibiotics. But in our usage, we are " prescribing their patients drugs." Prescribing what? "their patient drugs"? Is it some medication or therapy? No. Wrong.
B. psychologists have historically been forbidden to prescribe drugs for their patients, but in 2002, New Mexico began granting prescribing privileges - "forbidden to" is used correctly to emphasize the PERSON. Moreover, "granting" is a gerund acting as an object of the verb "began." "for" here shows the purpose, meaning psychologists have been forbidden to prescribe drugs for the treatment or benefit of their patients.
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 - the same issue of "prescribe their patients drugs" and the passive construction "began to be granted" while not inherently wrong is inferior.
D. historically psychologists have been forbidden from prescribing their patients drugs, but in 2002 New Mexico began to grant the privilege of prescribing - We need to "forbidden to" as the emphasis is on PERSON here and not on the ACTION. The same issue of "prescribing their patients drugs." "historically" as an adverb modifying "psychologists" noun?
E. historically psychologists have been forbidden from prescribing drugs for their patients, but in 2002 in New Mexico, they began granting prescribing privileges - the same "forbidden from" issues. Moreover, what is "they" referring to? Nothing? Wrong.