What Is Socrates's Point When He Says, "Do You See

What is Socrates's point when he says, "Do you see, Meno, what advances he [the boy] has made in his power of recollection? He did not know at first, and he does not know now, what is the side of a figure of eight feet. But then he thought that he knew, and answered confidently as if he knew, and had no difficulty. Now he has a difficulty, and neither knows nor thinks that he knows."

A) That the boy is better off in knowing his ignorance.
B) That the boy needs to be taught more of the Greek language.
C) That the boy doesn't understand basic Geometry.
D) That the boy will never be able to solve the problem.