Which of the Following Is an Example of Constructive Play

Which of the following is an example of constructive play?

A) Helena and Carter have converted the space below the dining table into a clinic and are playing the roles of a doctor and a patient.
B) Tasha, Marlene, and Wendy are playing hopscotch just outside their porch.
C) Karen and Drake are building a model of a house with a chimney from the discarded box of their new television set.
D) Keith and his older brother are playing with a Frisbee in their backyard.