RN 12 is related to PL 16 in a certain way. In the same way, EJ 17 is related to CH 21. To which of the following is FL 15 related to following the same logic?

Logic: first letter (-2), second letter (-2), third number (+4)

RN 12 is related to PL 16

R - 2 = P

N - 2 = L
12 + 4 = 16
Now, let's apply the same logic to EJ 17 and CH 21:
E - 2 = C
J - 2 = H
17 + 4 = 21
Finally, let's apply the same logic to FL 15:
F - 2 = D
L - 2 = J
15 + 4 = 19
So, FL 15 is related to DJ 19.
The correct answer is (A) DJ 19.