Correct Answer: GNWMQW

Solution : Given:
CHORUS is coded as UVTPJD and ANTHEM is coded as OFJUPB

Add 1 and 2 alternatively to the place value of the letters and the word formed is written in the reverse order to obtain the required code.
CHORUS→C + 1 = D; H + 2 = J; O + 1 = P; R + 2 = T; U + 1 = V; S + 2 = U = DJPTVU; Now reverse the obtained word = UVTPJD
Thus, CHORUS is coded as UVTPJD.
ANTHEM→A + 1 = B; N + 2 = P; T + 1 = U; H + 2 =J; E + 1 = F; M + 2 = O = BPUJFO; Now reverse the obtained word = OFJUPB
Thus, ANTHEM is coded as OFJUPB.
Similarly, VOLUME→V + 1 = W; O + 2 = Q; L + 1 = M; U + 2 = W; M + 1 = N; E + 2 = G = WQMWNG; Now reverse the obtained word = GNWMQW

So, VOLUME is coded as GNWMQW. Hence, the fourth option is correct.