We can listen to the sound on the other side of the wall but cannot...

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We can listen to the sound on the other side of the wall but cannot see through it because
I. wavelength of light is greater than sound
II. wavelength of light is smaller than sound
III. wavelength of light is much smaller than the dimensions of most obstacles
IV. wavelength of sound is greater than the dimensions of most obstacles
(a) I and II
(b) I, II and III
(c) II and III
(d) I, III and IV
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