Select the option that is related to the fifth letter cluster in the same way as the fourth letter cluster is related to the third letter cluster and the second letter cluster is related to the first letter cluster.
TEA: ZBDFSU :: SIN: MOHJRT :: RIO: ?

Correct option is A

The first letter of the first word becomes the last two letters of the second word (previous and next letters), and so on.
TEA → ZBDFSU
T becomes SU (previous and next letters of T).
E becomes DF (previous and next letters of E).
A becomes ZB (previous and next letters of A).
SIN → MOHJRT
S becomes RT (previous and next letters of S).
I becomes HJ (previous and next letters of I).
N becomes MO (previous and next letters of N).
Now applying the same logic to RIO:
RIO → ?
R becomes QS (previous and next letters of R).
I become HJ (previous and next letters of I).
O becomes NP (previous and next letters of O).
Thus, RIO becomes NPHJQS.
Therefore, the correct answer is (a) NPHJQS.