A small source of light is \( 4 \mathrm{~m} \) below the surface of...

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A small source of light is \( 4 \mathrm{~m} \) below the surface of a liquid of refractive index \( 5 / 3 \). In order to cut off all the light coming out of liquid surface, minimum diameter of the disc placed on the surface of liquid is :
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(A) \( 3 \mathrm{~m} \)
(B) \( 4 m \)
(C) \( 6 \mathrm{~m} \)
(D) \( \infty \)
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