The noise-reduction coefficient (NRC) of a material is evaluated between the frequency range of 250 Hz and 2 kHz because
a. it is virtually impossible to evaluate this property outside the above frequency range.
b. the human ear is insensitive to noise outside the above frequency range.
c. most of the sound energy in the noise produced in buildings lies in the given frequency range.
d. most of the sound energy in human speech lies in the given frequency range.
e. none of the above.
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