The equation \( s - s(17%) = s(83%) \) can be rearranged as follows:
- \( s(17%) \) represents 17% of the original amount \( s \).
- When we subtract \( s(17%) \) from \( s \), we are left with \( s(83%) \), which means we retain 83% of \( s \).
This matches the situation where the price of an item is reduced by 17%, making the retained value 83% of the original price.
Thus, the correct answer is:
D. the price for a shirt that originally cost s after a 17% discount.