Uniform backward shift by 4 positions (−4) across letters ABCD : WXYZ :: EFGH : ?

Introduction / Context:
This analogy uses a fixed backward displacement. In the example, each letter in ABCD is moved four places backward to give WXYZ. We must apply the same operation to EFGH.

Given Data / Assumptions:

• Mapping: A→W, B→X, C→Y, D→Z which is −4 per letter with wrap-around.
• We need EFGH → ? via the same −4 shift.
• Alphabet indexing A=1 … Z=26; wrap-around from A backward goes to W when shifting by 4.

Concept / Approach:
Use a uniform Caesar shift of −4 on each character of the source word. Since the shift is constant, apply it letter-by-letter to E, F, G, H.

Step-by-Step Solution:

Verification / Alternative check:
Check consistency: adding +4 to ABCD returns EFGH, confirming the inverse relationship.

Why Other Options Are Wrong:

• STUV/VUTS/ZYXW: These reflect different shifts or reversals and do not correspond to a uniform −4 applied to EFGH.

Common Pitfalls:
Confusing mirror (Atbash) with a fixed Caesar shift; reversing order instead of shifting.

Final Answer:
ABCD