As experts at the Nielsen Norman Group explain， there is a risk that a low-fidelity prototype may confuse test users because .

A.they will feel embarrassed for the amateurish designer

B.they expected to have a product demo， not a test

C.they may not understand what it is， or how it works

D.it may appear to be a finished product， so need need for feedback

正確答案：they may not understand what it is， or how it works