Answer:
The correct option is A) The molecule to which a drug binds
Step-by-step explanation:
A drug target can be described as any molecule which is present in an organism's body to which a certain drug can attach and cause therapeutic effect. Usually, the drug target is a certain type of proteins such as receptor proteins, enzymes etc. The drug can work in different ways on the drug target such as inhibiting the protein, changing its active site or changing its substrate etc. Hence, the correct option is A.