A Researcher Is Interested in Whether Eyewitnesses' Performance Will Be

A researcher is interested in whether eyewitnesses' performance will be affected by the culprit wearing a hat. Half of the participants will be shown a video of a crime where the suspect is wearing a hat, and will then see a lineup containing the suspect wearing a hat. The other half will see the same video, but the suspect will not be wearing a hat when they appear in the lineup. The researcher is worried that differences in visual acuity between the two groups of participants might be a confounding variable in this study. She can avoid this by:

A) dividing up participants into conditions based on visual acuity.
B) randomising the assignment of participants into her two conditions.
C) removing all conditions and testing memory only on the basis of visual acuity.
D) correlating visual acuity with memory ability.

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