Answer:
Horizontal positioning.
Step-by-step explanation:
Horizontal positioning is used to span most of the verticals so that more people are being targeted.
The company tends to specialise in different products so that when sales of one segment is falling they can rely on another segment.
In this instance Whole Foods offers organic, natural, and locally sourced products. They also have a higher price of 25% above other firms. They can do this because they make offerings no other firms have.
So they have a wider client range to serve. This is horizontal positioning.