To simplify the expression \( a^{67}b^{34} \), we can examine the options provided. The expression itself is already in its simplest form. It appears that some of the response options are incorrectly formatted or represent transformations that do not apply to the given expression.
However, if you were to write this expression as a fraction, it could be represented as:
\[ \frac{a^{67}}{b^{34}} \]
without any further simplification or transformation.
Therefore, if the goal is to keep it in a simple form, the answer is:
\( a^{67}b^{34} \) (this is already simplified).
If you need a specific choice from your options, please provide those options in a clearer format.