Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. PRT, OQS, NPR, ?

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Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. PRT, OQS, NPR, ?

AGAS

BMJS

CGHA

DMOQ

Answer:

D. MOQ

Read Explanation:

Observe each position separately:

Term	1st Letter	2nd Letter	3rd Letter
PRT	P	R	T
OQS	O	Q	S
NPR	N	P	R
?	M	O	Q

Each letter decreases by one alphabet position in every step:

P → O → N → M
R → Q → P → O
T → S → R → Q

Therefore, the missing letter-cluster is:

$\boxed{\text{MOQ}}$

Answer: MOQ.

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