Intensity of the single slit central maximum when the slit width is doubled

1. A.
   The intensity and width of the central maximum are unaffected.
2. B.
   The intensity remains same and angular width becomes half.
3. C.
   The intensity and angular width both are doubled.
4. D.
   The intensity increases by a factor 4 and the angular width decreases by a factor of 1/2

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1. A.
   $\dfrac{I_0}{2}$
2. B.
   $I_0$
3. C.
   $4I_0$
4. D.
   $2I_0$

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