What is a true statement about routes of administration for injectable agents?

C is the correct choice because intracardiac (IC) injection is an accepted method of administering euthanasia agents in animals that are heavily sedated, anesthetized, or in a comatose state. This route is typically used when rapid euthanasia is necessary, and the animal’s level of consciousness ensures that the procedure is humane and minimizes distress. It is crucial that the animal is in a suitable state to avoid any additional suffering during the administration of the euthanasia agent.

Other potential answers do not align with accepted practices in veterinary medicine. For instance, IP injections do not typically require the addition of a neuromuscular blocking agent as stated in the first choice. The second choice inaccurately describes IV administration; it is generally understood that IV administration allows for rapid onset and can lead to an expedited loss of consciousness, not the slowest. Lastly, IP administration is not optimal for irritating euthanasia agents as this can lead to pain or discomfort, making it inappropriate for this particular use.