The following children understand one concept each. In this context, who among the following children understands the principle of transitivity?

Berry is the correct answer.

The principle of transitivity suggests that in a relation between three elements where the first and second holds a relation, and also the second is related to the third, there must be a relation between the first and third, as well. Thus, Berry is the correct answer since he understands that if George is taller than Tina, and Tina is taller than Gia, George is taller than Gia.