All of the following are factors that influence the physical effects of drugs,EXCEPT for

A) the level of dosage.
B) the purity of the drug.
C) the method of administration.
D) the social environment.

Purity

The state of being free from contamination, pollution, or moral corruption.

Dosage

In a medical context, it refers to the amount and frequency of a drug or medication given to a patient.

Administration

The process or activity of running and managing the operations of an organization, institution, or government.