The Research of Dina Van Hiele-Geldof and Pierre Marie Van

The research of Dina van Hiele-Geldof and Pierre Marie van Hiele suggests that:

A) describing, classifying, and generalizing attributes of geometric figures should be central to the study of geometry in the elementary school curriculum.
B) recognizing and naming geometric figures is the central purpose of elementary school geometry.
C) elementary school students should develop proofs using postulates and axioms.
D) geometry is too difficult for elementary school students and should be delayed until later grades.