The walls and ceiling of an auditorium are covered with a fibrous material to:

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Make the auditorium fireproof.

Absorb sound waves and prevent echoes and reverberations.

To reflect sound from the walls and ceilings.

To prevent leakage of water from the roof

answer is B.

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Detailed Solution

An echo is a repetition or a partial repetition of a sound due to reflection. When the sound is reflected multiple times and separate repetitions of the original sound are not distinguishable, it is called reverberation.
In auditorium's walls and ceiling are covered in a fibrous material to absorb sound and prevent echoes.
The sound produced in a large space will continue to be reflected off the walls repeatedly until it is reduced to the point where it is no longer audible. This persistence of sound is due to reverberation.
A large hall or theatre should not have considerable reverberation.

Therefore, the walls and ceilings of the auditorium are covered with fibrous material to absorb sound and prevent echoes and reverberations.

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