Find the best option that best completes the analogy.
CAB : EDF :: GIH : ?

The correct option is ILL.

To solve this analogy, let us analyze the pattern connecting the first pair of letter groups, CAB and EDF.

Let us look at the positional values of the letters in the English alphabet:

C = 3, A = 1, B = 2
E = 5, D = 4, F = 6

Now, let us compare the corresponding letters of CAB and EDF:

First letter: C (3) + 2 = E (5)
Second letter: A (1) + 3 = D (4)
Third letter: B (2) + 4 = F (6)

So, the rule for transforming the first group into the second group is to add 2 to the first letter, 3 to the second letter, and 4 to the third letter (+2, +3, +4).

Now, let us apply the exact same (+2, +3, +4) rule to the second pair starting with GIH:

G = 7, I = 9, H = 8

Applying the pattern step-by-step:

First letter: G (7) + 2 = 9, which corresponds to I
Second letter: I (9) + 3 = 12, which corresponds to L
Third letter: H (8) + 4 = 12, which corresponds to L

Combining these resulting letters gives ILL.

Therefore, the term that completes the analogy is ILL.