[单选题]
In order to produce a holowyo-4it:nyb:3 /dl k7ml uwc.gram, one needs, in addi39k*yon: ce5lmc1 vj ztion to an object and a piece of photograph:e3 z oj1kc5*vy9 mlcnic film,
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.