Answer: b. through the stomach
Step-by-step explanation:
A drug is a substance which is capable of bringing the physical and physiological change in an organism when taken either orally, intravenously, subcutaneously, smoked or inhaled.
The drug which is taken orally or ingested enters the elementary canal. It is dissolved inside by the fluids in stomach, then absorbed by the bloodstream through the linings of the stomach and later by the intestine.