[单选题]
In which of the followi5fk.rdh 8cnr +ng is dtujx3 o8)a;fuiffraction NOT exhibited?
A. viewing a light source through a small pinhole
B. examining a crystal by X-rays
C. using a microscope under maximum magnification
D. resolving two nearby stars with a telescope
E. determining the direction of polarization with a birefringent crystal