One term in the number series is wrong. Find out the wrong term. 93, 309, 434, 498, 521, 533

The answer is $\boxed{\text{D}}$.

The number series is $93, 309, 434, 498, 521, 533$. The difference between any two consecutive numbers is $116$. However, the difference between $498$ and $521$ is $23$, which is not a multiple of $116$. Therefore, $521$ is the wrong term.

Here is a step-by-step solution:

1. Find the difference between any two consecutive numbers.
2. If the difference is not a multiple of a certain number, then that number is the wrong term.
3. In this case, the difference between $498$ and $521$ is $23$, which is not a multiple of $116$. Therefore, $521$ is the wrong term.