Which Was NOT Described in the Text as One of the Criticisms

Which was NOT described in the text as one of the criticisms of Lenore Walker's research that led to her descriptions of the battered woman?

A) The data was collected in door-to-door canvassing of a limited number of San Francisco neighborhoods.
B) Only a minority of the women surveyed had experienced all three stages of the hypothesized cycle of abuse.
C) Those who collected the data were aware of the hypotheses, which may have caused experimenter bias.
D) There was no systematic comparison of women suffering other forms of trauma or no trauma at all (control) .