Final answer:
Without more context, the best representation for the remaining stones after accounting for the top and bottom of a frame is 2s, assuming that 's' represents the number of stones on one side and that there are no shared corner stones.
Step-by-step explanation:
To determine which expression best represents the number of stones remaining after accounting for the top and bottom of the frame, it is essential to understand the overall structure mentioned. However, it seems like there might be some information missing to provide a precise answer. Suppose the frame is a rectangle constructed using stones, with 's' representing the number of stones on a single side, and assuming the top and bottom are each made of 's' stones. Then, if we remove the top and bottom stones, we are left with the sides only, which would be the remaining stones.
If there are four sides to the frame and we have already accounted for the top and bottom, then only the two sides remain unaccounted for. Hence, the total number of stones left on the sides would be twice the number of stones on one side, which is represented by the expression 2s (where 's' is the number of stones on one side). This assumes that there are no corner stones that are shared between the sides.
If additional information is provided or there are specifics about the arrangement of stones, the expression could be different. Without more context, the best representation based on the given information is 2s.