Concept:
This analogy focuses on alphabetical block sequences within the standard 26-letter alphabet.
Step 1: Analyzing the sequence
The analogy ABCD : WXYZ links the first 4 letters of the alphabet to the last 4 letters (W, X, Y, Z).
The sequence STUV corresponds to positions 19, 20, 21, 22.
Step 2: Determining the mapping
In the analogy pattern, we are identifying which four-letter block corresponds to the target sequence.
Given the options and the standard reverse-alphabetic block mapping, the block WXYZ provides the consistent completion.
{WXYZ}