What should never be administered to a diabetic passenger experiencing an emergency?

In an emergency situation involving a diabetic passenger, administering insulin is not appropriate without careful consideration and context. Insulin is a medication that lowers blood sugar levels, and giving it without a proper assessment can lead to severe hypoglycemia (low blood sugar) if the person is already experiencing low blood sugar levels. In contrast, the other options listed—oral glucose gel, sugar packets, and orange juice—are typically administered to quickly elevate blood sugar levels in cases of hypoglycemia, which is a common emergency for diabetics. Therefore, understanding when and how to administer insulin, along with the specific condition of the passenger, is crucial; hence, this should be avoided in a general emergency scenario without professional guidance.