Answer:
conservation.
Step-by-step explanation:
Conservation: The term conservation is given by a psychologist named Jean Piaget in his theory of cognitive development.
According to Piaget, the term conservation refers to the logical or rational thinking ability of an individual that permits the individual to demonstrate that a specific quantity will remain the same as the previous quantity was even if it is being changed to the other container, apparent size, or shape.
It occurs around the age of seven to eleven years i.e, in the operational stage of development.
In the question above, Ray was most likely testing Mason's concept of conservation.