Final answer:
Vertical placement of rollers creates maximum volume in a hair style.
Step-by-step explanation:
The type of roller placement that would create maximum volume in a hair style is vertical placement. Vertical placement refers to placing the rollers in a vertical direction, from the roots to the ends of the hair. This allows the hair to be lifted and create more volume. Horizontal placement would create a flatter look, diagonal placement can create volume in specific areas, and random placement may not provide consistent volume throughout the hair.