A mother gives her 3-year-old and her 4-year-old children chocolate milk in identically shaped glasses to avoid conflict over who has more. The mother is showing her awareness of her children's difficulty with the concept ofa. language.
b. object permanence.
c. conservation.
d. symbolism.

c. conservation.  

Explanation:

Conservation: In psychology, the concept of "conservation" was proposed by one of the renowned psychologists named Jean Piaget and is described in the preoperational stage of the cognitive development theory at the age of four-five years yet it completely develops around seven-eleven years in the concrete operational stage.

The process of "conservation" is explained as the tendency of an individual to gain the capability of thinking logically that leads an individual to believe that a specific quantity will remain same irrespective of the container's adjustment with respect to the size or shape.

In the question above, the given statement signifies the concept of "conservation".

answer; control group;