Select the option which is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster.
RED ∶ GHU ∶∶ BLUE ∶ HXOE ∶∶ PINK ∶ ?

Let's analyze the pattern between the letter clusters:
First pair: RED ∶ GHU

R
opposite

​
I
−2

​
G

E
opposite

​
V
+2

​
X (Wait, let's look at another pattern)

Let's try direct positional additions/subtractions or reverse letter logic:

R→U (last letter of GHU): R(18)+3=U(21)

E→H (middle letter of GHU): E(5)+3=H(8)

D→G (first letter of GHU): D(4)+3=G(7)
So the pattern is: Reverse the order of letters, then add +3 to each letter.

Let's check if this holds for BLUE ∶ HXOE:

Reverse of BLUE is E U L B.

Add +3 to each:

E+3=H

U+3=X

L+3=O

B+3=E

This gives HXOE. The pattern is correct!

Now, applying this to PINK:

Reverse of PINK is K N I P.

Add +3 to each letter:

K(11)+3=N(14)

N(14)+3=Q(17)

I(9)+3=L(12)

P(16)+3=S(19)

The resulting cluster is NQLS.