Which of the following statements is NOT true, according to the passage？A．Most of the rese

Which of the following statements is NOT true, according to the passage？

A．Most of the research made on ageism is empirical and incomplete.

B．The inconstant nature of the age classification makes it different from other "isms".

C．This discrepancy referred to in the last paragraph is only concerned with methods.

D．The self concept may vary with the change in the ageist attitudes.