Phillip gives his sister the taller glass knowing that his mom poured the same amount of milk in his glass, too. phillip is likely how old?

a. two years old
b. four years old
c. six years old
d. eight years old

I believe the correct answer is D. eight years old.
The question refers to psychology and Jean Piaget's research about children's development. Given that the child understood there is the same amount of milk in both glasses (even though one of them is taller than the other), it means that he is in the concrete operations stage of development, which starts at about 7-8 years of age.

I would answer C six years old.

At four, they still have difficulties to drink in a glass
At 6, they're old enough to drink in a glass

Hope I helped !