Correct Answer: WART : SSZX

Solution : Given:
ROCK : JDNS

Add and subtract 1 alternatively from the place value of the letters of ROCK and then reverse the order of the letters obtained to get the related letter cluster.
R + 1 = S; O – 1 = N; C + 1 = D; K – 1 = J
SNDJ→JDNS
So, ROCK is related to JDNS.

Let's check the options –
First option: WART : SSZX; W + 1 = X; A – 1 = Z; R + 1 = S; T – 1 = S→XZSS; Now, on reversing the order of the letters, we get→SSZX
Second option: PICK : LDHQ; P + 1 = Q; I – 1 = H; C + 1 = D; K – 1 = J→QHDJ; Now, on reversing the order of the letters, we get→JDHQ ≠ LDHQ
Third option: GOLA : YMPH; G + 1 = H; O – 1 = N; L + 1 = M; A – 1 = Z→HNMZ; Now, on reversing the order of the letters, we get→ZMNH ≠ YMPH
Fourth option: DRUM : LVQC; D + 1 = E; R – 1 = Q; U + 1 = V; M – 1 = L→EQVL; Now, on reversing the order of the letters, we get→LVQE ≠ LVQC

So, only the first option follows the same logic as followed by the given pair of letter clusters. Hence, the first option is correct.