On the Table Were Two Pieces of String That Were

Multiple Choice

On the table were two pieces of string that were identical in length. As Markus watched, one string was rearranged in a circular pattern. Markus then confidently said that the straight piece of string was longer. Markus is:

A) displaying cognitive abilities that are typical of the concrete operational level.
B) in the zone of proximal development.
C) displaying cognitive abilities that are typical of the preoperational level.
D) in the formal operational stage of development.