We have to rank the tools from the one that is least precise to the one that is the most precise.
The precision depends on the smallest unit that the tool can measure.
In this list, the least precise is the highway mile marker, as it can not measure nothing that is less than a mile.
Next is the five-foot branch, as anything with a length less than 5 foot can not be precisely measured with this.
Next is the length of a persons foot, with a precision of one foot.
Lastly, the yardstick, that has precision of fractions of inches.
Answer:
Highway mile marker (least precise)
A five foot branch from a tree
The length of a persons foot
A yardstick (most precise)