Which factors help determine the needle size for an injection?

• A. Size of the muscle, thickness of adipose tissue at injection site, the volume of the material to be administered, injection technique, and depth below the surface into which the material is to be injected
• B. The route of administration determines the needle size
• C. The viscosity of the medication alone determines the needle size
• D. The patient's age determines the needle size

Answer: (A)