Final answer:
To manage the situation, the clinician should provide epinephrine.
Step-by-step explanation:
To manage the situation of swelling in the throat and a drop in blood pressure after a local anesthesia injection, the clinician should provide epinephrine (option b). Epinephrine is a medication that can counteract the drop in blood pressure, constrict blood vessels to increase blood pressure, relax smooth muscles in the lungs to improve breathing, and reduce swelling that may block the airways. It is commonly used to treat severe allergic reactions like anaphylaxis, which can cause throat swelling and drop in blood pressure.