Final answer:
Subcutaneous vaccines are administered in the deltoid muscle of the upper arm.
Step-by-step explanation:
The correct answer is b) Deltoid muscle.
Vaccines administered sub Q (subcutaneously) are injected just below the surface of the skin and into the fatty tissue. The deltoid muscle, located in the upper arm, is a common site for subcutaneous injections.
When given subcutaneously, the vaccine is absorbed slowly into the bloodstream, allowing for a slow release of the medication and longer-lasting effects.