Final answer:
B) pelvis
The pelvis is the most useful bone for a forensic anthropologist to determine the sex of deceased individuals, due to distinctive differences between male and female pelvic structures.
Step-by-step explanation:
According to the "Sherlock Bones" Lab, the bone that would be most useful for a forensic anthropologist to determine the sex of an individual that has died is B) pelvis. The pelvis, or hip bone, provides key indicators that are helpful in sex estimation due to the differences in shape related to childbirth. The female pelvis tends to be wider, shallower, and has a broader angle between the pubic bones when compared to the male pelvis, which is typically narrower and heavier.