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14. Researchers have questioned the use of costly and

experimental diagnostic tests to identify food aller-

gies, such as milk, that supposedly disrupt normal

behavior.

(A) to identify food allergies, such as

(B) to identify food allergies, like

(C) to identify food allergies, such as to

(D) for identifying food allergies, like that of

(E) for identifying food allergies, such as for

answer is c); but in c), 'to' parallel with which one ?