Correct option is D
Logic: In the Given word-
first letter H + 3 = K, Second letter F + 3 = I
Number: The number decreases by half.
HF 16 → KI 8:
Letters:
H to K: H is the 8th letter of the alphabet, and K is the 11th. The difference is +3.
F to I: F is the 6th letter, and I is the 9th. The difference is also +3.
Numbers:
16 to 8: The number decreases by half.
RP 10 → US 5:
Letters:
R to U: R is the 18th letter, and U is the 21st. The difference is +3.
P to S: P is the 16th letter, and S is the 19th. The difference is +3.
Numbers:
10 to 5: The number decreases by half.
Applying the Same Logic to NL 6:
Letters:
N to Q: N is the 14th letter, and Q is the 17th. The difference is +3.
L to O: L is the 12th letter, and O is the 15th. The difference is +3.
Numbers:
6 to 3: The number should decrease by half.
So, NL 6 should be related to QO 3.
Thus, the correct answer is:(d) QO 3