Final answer:
Female service members are permitted to wear small stud earrings with service, dress, and mess uniforms, which should be spherical, and not exceed 6mm in diameter.
Step-by-step explanation:
The question pertains to the uniform regulations regarding the wearing of earrings by females in the service. The correct answer is A. Yes, only small stud earrings. Generally, military dress regulations allow female service members to wear a single small stud earring in each earlobe that conforms to the uniform standards, which is often considered professional and unobtrusive. These earrings should be spherical in shape, generally gold, silver, diamond, or pearl, and not exceed 6mm in diameter. This applies when wearing service, dress, and mess uniforms. The option of wearing any type of earrings or dangling earrings of certain length is not standard within the strict dress codes of military uniforms.