People with _______ Perform Worse on Learning and Memory Tests

Multiple Choice

People with _______ perform worse on learning and memory tests than people with ______.

A) One copy of the Val allele;one copy of the Met allele
B) one copy of the Met allele;two copies of the Met allele
C) two copies of the Val allele;two copies of the Met allele
D) two copies of the Met allele;two copies of the Val allele