The correct answer is
C. Nerisa did not make a mistake. She completed each step using the appropriate rules of exponents and calculations.
In step A and B, she used the Negative Exponent Rule to accurately evaluate
![4^(-2)](https://img.qammunity.org/2019/formulas/mathematics/high-school/lqbldri0hvlcvx689du5pt90x72jln21rc.png)
. In step C, she wrote 256 over 16 which is the correct way to multiply a whole number and a fraction. Lastly, she evaluated
![(256)/(16)](https://img.qammunity.org/2019/formulas/mathematics/high-school/omze0ksrc5nwv10mui89h5brs6vbdknl2o.png)
to get 16.
All of her calculations are correct.