Final answer:
Option B) 23 gauge would be an appropriate gauge needle for an ID injection.
Step-by-step explanation:
The appropriate gauge needle for an ID (intradermal) injection would be option B) 23 gauge.
An ID injection is a type of injection that is administered into the dermis layer of the skin. It is usually used for diagnostic tests, such as tuberculin skin tests.
A 23 gauge needle is ideal for ID injections because it is thin enough to minimize discomfort, but still allows for accurate delivery of the injected substance into the dermis.