Which of the Following Represents a Valid Criticism of the Methodology

Which of the following represents a valid criticism of the methodology of Watson and Rayner's "Little Albert" study?

A) Using a loud clang as a conditioned stimulus is not an acceptable scientific practice.
B) The behavior of an infant is not representative of adult human behavior.
C) Albert's fear and distress were not objectively measured, but were subjectively evaluated by the experimenters themselves.
D) The experimenters did not evaluate Albert's responsiveness to different stimuli.