[单选题]
In order to produce a hologram, one fylx3:by: /wfneeds, in additin xs *xfw6hu07on to an object and a piece of photographic hxs 0xwf 7*nu6film,
A. a beam of monochromatic light and a mirror.
B. a beam of monochromatic light and a lens.
C. a beam of coherent light and a lens.
D. a beam of coherent light and a mirror.
