A thin layer of water is transparent but a very thick layer of water is

translucent

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opaque

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most transparent

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none of these

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Solution

The correct option is A
translucent

correct option (A):
Translucent medium- The medium through which light can pass partially is called a translucent medium.
Thick layer of water and a thin sheet of paper are examples of translucent medium
incorrect options:
B- A thick layer of water will not be opaque as it will not block light.
C- When light passes through a thick layer of water it may absorb some portion of it making it translucent not most transparent.
Hence, the correct option is (A)

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