Final answer:
A forensic anthropologist helps to confirm human remains and assists in identification by estimating age, sex, race, and stature, providing crucial data for determining the cause and manner of death.
Step-by-step explanation:
A forensic anthropologist can be pivotal in a missing person's case, especially after human remains have been located in a setting such as a rock quarry. Forensic anthropology is applied to assess whether remains are human, and if so, assist in identifying the individuals through various methods such as archaeological excavation and the analysis of skeletal and dental evidence. After confirming the remains to be human, the forensic anthropologist estimates the age, sex, race, and stature of the individual. Though they stop short of determining the cause of death, their findings provide critical data for the forensic pathologist, who can then determine the cause and manner of death. Therefore, the most accurate answer to how a forensic anthropologist could assist in this case would be by confirming that the bones found are human (C) and potentially linking the missing person to the body in the quarry (B) based on the biological profile they establish.