Mrs Miller Told Her Third-Grade Class to Line Up from Shortest

Mrs. Miller told her third-grade class to line up from shortest to tallest. They were able to get in line very quickly. Why were they able to accomplish this task so fast?

A) Because they are able to display transitive inference.
B) Because they have the classification ability of seriation.
C) Because they understand conservation.
D) Because they have sensorimotor ability.