Which One of the Following Statements Is False

Which one of the following statements is false?

A) The diets of most Americans supply more than adequate amounts of vitamin B-12.
B) In older persons the risk of low vitamin B-12 status increases due to diminished vitamin B-12 absorption.
C) Most cases of pernicious anemia in the United States are due to inadequate production of intrinsic factor.
D) Most cases of vitamin B-12 deficiency seen in the United States are due to a dietary deficiency of the vitamin.