Final answer:
The most reasonable constraint for the minimum length each side of the garden must be, considering the fencing length and practical construction standards, is 10 inches.
Step-by-step explanation:
The question revolves around finding constraints for the dimensions of a rectangular garden given the total length of fencing available. Since the fencing is 55 feet in total and must form a rectangle, this implies the constraint for the length and width that both must be greater than 0 feet but no greater than 27.5 feet each.
However, the question seems to focus on a detail regarding the minimum size in inches for each side, which suggests a discussion about practical limitations such as the spacing of fence posts or construction standards that require each side to be greater than a certain length in inches.
Given the fencing length constraint, the smallest value in the options provided which aptly conveys a reasonable practical limit to the construction would be option a) 10 inches for each side's minimum length. This allows for a sufficiently small granularity in fence post spacing while still providing a sizable enough increment to ensure stability and structure of the garden fence.