Knut Begins a Study of Nose-Picking at Home Depot,but After

Knut begins a study of nose-picking at Home Depot,but after informing potential participants,he finds that no one picks his or her nose.He wants to reduce the Hawthorne effect,so he

A) waits,because people will resume their usual behavior fairly quickly.
B) begins in another location where he does not ask for consent.
C) goes native and picks his own nose in public.
D) shifts his role from participant observer to observer.