Classification — alphabet set: choose the letter that is different in kind from the others.

Introduction / Context:
This is a simple alphabet classification. Three options are consonants; one is a vowel.

Given Data / Assumptions:

• I → vowel.
• J, K, L → consonants.

Concept / Approach:
Group by vowel vs consonant category.

Step-by-Step Solution:

Verification / Alternative check:
Basic English vowel list: A, E, I, O, U (sometimes Y).

Why Other Options Are Wrong:
They are consonants and align with one another.

Common Pitfalls:
Overcomplicating with position in alphabet; vowel/consonant is the intended cue.

Final Answer:
I