The answer is $\boxed{\text{C}}$.
The sequence is $15, 16, 22, 29, 45, 70$. The difference between consecutive terms is $1, 6, 7, 16, 25$. The only term that does not follow this pattern is $45$. The difference between $45$ and $29$ is $16$, which is not a multiple of $7$. Therefore, $45$ is the wrong term.
Here is a table showing the sequence of numbers and the differences between consecutive terms:
| Term | Number | Difference |
|—|—|—|
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