The material generally used for sound proofing of rooms like a recording studio and auditorium, etc. is

cotton

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coir

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wood

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styrofoam.

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Solution

The correct option is B styrofoam.
The material by and large utilized for sound sealing of rooms like chronicle studio, film lobby, assembly hall which assimilate sound and encourage in sealing is styrofoam. Earplugs are comprised of fine glass wool or cottonwood impregnated with wax while ear covers contain liquid seals or plastic froth for engrossing sound.
So, the correct option is 'styrofoam.'.

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