In the testing, Dr. Aiken cut the background from those photos for the purpose of______.A．

In the testing, Dr. Aiken cut the background from those photos for the purpose of______.

A．grouping those couples again

B．leaving no trace for the testees

C．imitating those couples" life

D．leaving the testees more chances

请帮忙给出正确答案和分析，谢谢！

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