Final answer:
The correct surgical instrument functioning as a vaginal speculum is B. Auvard. Other instruments listed are used for different surgical procedures and are not speculums.
Step-by-step explanation:
A vaginal speculum is a tool used by medical professionals to inspect the vagina and cervix by expanding the vaginal walls. The Auvard speculum, mentioned in option B, is a weighted speculum used for this purpose, especially during gynecological examinations or procedures. It differs from other speculums due to its heavy end that keeps it in place without needing to be held.
Other instruments listed, such as the Bozeman (a type of forceps), Doyen (intestinal forceps), and Heaney (used in hysterectomy procedures), have various specific uses in surgery but do not function as speculums. The use of the Auvard speculum allows for a clear view of the vaginal walls and the cervix, which is vital for examinations, Pap smears, and certain surgical procedures. Its design is focused on providing optimal visibility while ensuring patient comfort.