Upon Entering the Body, Are Drugs Gradually Oxidized or Reduced

Upon entering the body, are drugs gradually oxidized or reduced?

A) The drugs are broken down, or reduced to smaller products during the metabolic process.
B) The body's mechanisms for oxidizing foods act on drugs causing them to be oxidized as well.
C) Some drugs are oxidized and some are reduced, depending on the type of drug ingested.
D) Drugs are not oxidized or reduced. They are simply metabolized.