Find the odd 4-character pattern (+2, +1, +2 across cases): Pick the item that does not follow “+2, +1, +2”.

Introduction / Context:
Alternating-case sequences still map to the same alphabetical index. Here, most items step +2, then +1, then +2. The outlier changes the first step magnitude, which exposes it immediately when the arithmetic is checked.

Given Data / Assumptions:

• BdEg: B→d (+2), d→E (+1), E→g (+2) → fits.
• PrSu: P→r (+2), r→S (+1), S→u (+2) → fits.
• KmNp: K→m (+2), m→N (+1), N→p (+2) → fits.
• TwXz: T→w (+3), w→X (+1), X→z (+2) → first step +3, so breaks the rule.

Concept / Approach:
Ignore case, compute three successive differences, and match against the template (+2, +1, +2). The one with a different first step is odd.

Step-by-Step Solution:

Verification / Alternative check:
Visual spacing on an alphabet line shows a wider first gap only for the outlier.

Why Other Options Are Wrong:
They maintain the same +2, +1, +2 cadence.

Common Pitfalls:
Do not be distracted by wrap-around concerns; none of the conforming items require wrapping.

Final Answer:
TwXz