The case sensitive among these is . . . . . . . .

This question asks you about which element in MySQL is case-sensitive, meaning it distinguishes between uppercase and lowercase letters. Let's break down the options:
Option A: Stored function name: MySQL treats stored function names as case-insensitive. This means "myFunction" and "MyFunction" are considered the same.
Option B: Stored procedure name: Similar to stored functions, MySQL handles stored procedure names as case-insensitive.
Option C: Trigger name: Trigger names are also case-insensitive in MySQL.
Option D: Event name: Event names are the only element in MySQL that is case-sensitive. This means "myEvent" and "MyEvent" are considered different events.
Therefore, the correct answer is Option D: Event name.