14.   Researchers have questioned the use of costly and experimental diagnostic tests to identify food allergies, 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（C）

(E) for identifying food allergies, such as for

答案选c,我选了a,是针对allergies举例呀,c中such as to 什么意思，难道是针对to identify举例,然后省去了identify,也讲不通啊,请大侠指教!