The function returning reference to hash of row values is . . . . . . . .

This question is about how to get data from a MySQL database in a way that's easy to work with in your code. Imagine you're asking the database for information about a student, and you want to store the student's name, age, and grade in separate variables. Here's the breakdown:
Option A: fetchrow_array() - This function returns an array, meaning the data will be stored in a numbered list like this:
``` [0] => name [1] => age [2] => grade ```
Option B: fetchrow_arrayref() - Similar to Option A, this also gives you an array, but it's a bit more advanced for programmers who know about references.
Option C: fetch() - This is a more general function that can give you data in different formats, but it's not specifically designed for a nicely organized hash.
Option D: fetchrow_hashref() - This is the answer! It returns a hash, which means the data is stored like a dictionary with key-value pairs, making it easy to access specific information directly:
``` name => "John Doe" age => 12 grade => "A" ```
So, the correct answer is Option D: fetchrow_hashref() because it returns a hash (like a dictionary) containing all the values of the row, making it easy to access individual data points.