MrAnd MrsDavidson Took Their Son to a Psychologist Who Diagnosed Him

Mr.and Mrs.Davidson took their son to a psychologist who diagnosed him as conduct disordered.They decided to get a second opinion from another psychologist and were told their son was just going through a normal phase.This example reflects a problem of

A) lack of reliability.
B) categorical classification.
C) misinterpreting symptoms.
D) dimensional classification.
E) lack of validity.