Find the option that best completes the analogy.
BF : KL :: DK : ?

The correct option is MQ.

To solve this letter analogy, let us analyze the relationship between the first pair of letter groups, BF and KL, by examining their numerical positions in the English alphabet:

B = 2, F = 6
K = 11, L = 12

Let us look at the pattern connecting the corresponding letters from the first group to the second group:

1. First letter position change: B (2) to K (11)
2 + 9 = 11 (K)

2. Second letter position change: F (6) to L (12)
6 + 6 = 12 (L)

So, the pattern increases the positional index of the first letter by 9, and the second letter by 6.

Now, let us apply the exact same pattern to the third group, DK:

D = 4, K = 11

1. First letter: D (4)
4 + 9 = 13, which corresponds to the 13th letter in the alphabet, M.

2. Second letter: K (11)
11 + 6 = 17, which corresponds to the 17th letter in the alphabet, Q.

Combining these results gives us MQ.