When Mary Looks at the Following Display She Tends to See

When Mary looks at the following display she tends to see horizontal rather than vertical rows of happy faces.This happens because:

A) horizontal displays tend to be perceived as figure and vertical displays as ground.
B) lines and patterns tend to be perceived as continuing in time and space.
C) the items are in horizontal rows share the same internal features.
D) items that are near each other tend to be grouped together.