Answer:
A) the range of variation
Step-by-step explanation:
In statistics, the range is a measure of variation which includes the highest value and the lowest value, in other words, the extreme points.
In this case, the range of variation represents the extreme points at which it is OK to plant our seeds. If we plant seeds more than 13" apart then we aren't doing it correctly, the same if we pant them less than 11" apart.