问答题

The reason why the studys design allowed 'an even more wild hypothesis' was that______.
A.the part of the brain had never been studied before
B.it entailed using a machine to look at a certain area of the brain
C.it meant adding the notion that infant shyness could be measured in adults
D.it added the possibility that shyness was related to social phobia

A.
A.the
B.it
C.it
D.it
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