Answer:
Concrete Operational
Explanation:
By Piaget's theory, concrete operational is the third stage of child development, and it lasts from 7 to 11 years.
We recognize that the example from the question is this stage as children during this age develop logical thinking about various concepts and events, become more organized, concrete when speaking and thinking, and are able to reason better. Children are still struggling with abstract concepts and ideas, but their logical thinking develops better.
By measuring how much water there is in the glass and realizing the amount is the same, Tamara shows the signs of clear, concrete logical thinking.