To find out how much money Avery had left in her wallet after buying lunch, you can subtract the amount she spent on lunch from her original total.
- Original amount: $25.57
- Amount spent on lunch: $8.75 (since 8 3/4 dollars is equal to 8.75)
Now, perform the subtraction:
\[ 25.57 - 8.75 = 16.82 \]
So, Avery had $16.82 left in her wallet after lunch.
Therefore, the answer is D. $16.82.