Find the odd letter (vowel vs consonant): Pick the one that is a consonant while the others are vowels.

Introduction / Context:
A quick way to solve many letter-classification questions is to separate vowels from consonants. The presence of a single consonant among vowels (or vice versa) yields an immediate odd-one-out.

Given Data / Assumptions:

• O, I, E → standard vowels.
• B → consonant.

Concept / Approach:
Apply the vowel–consonant property. The singleton by this property is the outlier.

Step-by-Step Solution:

Verification / Alternative check:
Consult the standard vowel list (A, E, I, O, U). “B” is absent, confirming it is a consonant.

Why Other Options Are Wrong:
They share the vowel category.

Common Pitfalls:
Do not overthink; the simplest linguistic attribute suffices here.

Final Answer:
B