The slits in a Young's double-slit experiment have equal widths, and the source is placed symmetrically relative to the slits. The intensity at the central fringe is $I_0$. If one of the slits is closed, the intensity at this point will be
- A$I_0$
- B$I_0 / 4$
- C$I_0 / 2$
- D$4I_0$
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