Which of the Following Individuals Is at Highest Risk for Developing

Which of the following individuals is at highest risk for developing a vitamin B₁₂ deficiency anemia?

A) 47-year-old male who had a gastrectomy procedure (removal of the stomach)
B) 64-year-old male with a history of duodenal ulcers and gastrointestinal bleeding
C) 26-year-old female in the second trimester of her first pregnancy
D) 3-year-old female who is a fussy eater