The bit rate for a signal, which has a sampling rate of 8 kHz and where 16 quantisation levels have been used is

The correct option is A 32000 bits/sec

If n is the number of bits per sample, then number of quantisation level = $2^n$
Since the number of quantisation level is 16
$\Rightarrow 2^n=16\Rightarrow$ n = 4
$\therefore$ bit rate = sampling rate $\times$ no.of bits per sample
= 8000 $\times$ 4 = 32,000 bits/sec