Final answer:
The parenteral routes of medication administration include subcutaneous, intradermal, intravenous, and intramuscular injections. The most appropriate and convenient parenteral route for home administration of an antimicrobial to treat a systemic infection would be intravenous (option B).
Step-by-step explanation:
The parenteral routes of medication administration include subcutaneous, intradermal, intravenous, and intramuscular injections. These routes bypass the digestive tract and deliver the medication directly into the bloodstream or other tissues. The most appropriate and convenient parenteral route for home administration of an antimicrobial to treat a systemic infection would be intravenous (option B), which involves injecting the medication directly into a vein.