Select the option that is related to the third term in the same way as the second term is related to the first term.
AC : CI :: GH : ?

Let us look at the numerical positions of the letters for AC : CI:
A=1,C=3

C=3,I=9

The relation is:

First letter of second term = A×3=1×3=3→C

Second letter of second term = C×3=3×3=9→I
Essentially, each positional value is multiplied by 3.

Let us apply this rule to GH:

G=7→7×3=21→U

H=8→8×3=24→X

Thus, the corresponding term is UX.