Final answer:
The correct route for administering Imitrex STATdose is subcutaneous, and the usual injection site is the upper outside part of the arm, making option B the correct answer.
Step-by-step explanation:
The correct route of administration for Imitrex STATdose, which is prescribed for relief at the onset of migraine symptoms, is subcutaneous (SC), and the usual injection site is the upper outer arm or the thigh.
This means the correct answer to the question is B. SC, upper outside arm. Imitrex (sumatriptan) STATdose is specifically designed for self-injection to quickly alleviate migraine symptoms and is not intended for intramuscular (IM) or sublingual (SL) administration.