The numbers that are prefixed with '0x' are in base . . . . . . . .

This question is about how MySQL represents numbers.

In MySQL, when you see a number with '0x' before it, like '0x1A', it means the number is written in hexadecimal.

Here's what you need to know:

* Decimal (base 10): The number system we use every day (0, 1, 2, 3, 4, 5, 6, 7, 8, 9).
* Hexadecimal (base 16): Uses digits 0-9 and letters A-F.

So, the answer is Option B: 16.

Think of '0x' as a special marker saying, "This number is written in hexadecimal!"