Final answer:
Megan would be classified as a global processor according to Klein, as she fails to perceive any differences in the size of squares and instead processes the overall structure of the sets of squares.
Step-by-step explanation:
According to Klein, Megan would be classified as a global processor. Global processing refers to the ability to perceive the overall structure or pattern of a visual display, rather than attending to the individual elements. In Megan's case, she fails to perceive any differences in the size of squares, indicating that she is not processing the individual elements but rather perceiving the overall structure of the sets of squares.