To simplify the expression \( a^{67} b^{34} \), we can rearrange or express it in different forms, but since it seems you provided different possible responses, it is likely you're looking for a specific simplification.
However, without additional context on any operations to perform, the simplest representation of \( a^{67} b^{34} \) remains:
- \( a^{67} b^{34} \) (Original expression)
- Alternatively, you can express it in a fraction format if required, such as \( \frac{a^{67}}{b^{34}} \).
Among the responses you've provided, only \( a^{67}/b^{34} \) matches the original expression as a fraction.
If you intended to express it differently or simplify further with respect to any specific variable, please let me know!