In which of piaget's stages does the child become capable of understanding conservation?

I believe the answer is: concrete operations

during concrete operations, Humans started to develop the ability to performing logical thought. This granted children with the ability to connect a certain information with another that allow them to follow and understand the conversation initiated by other people.

He was probably very upset and disapointed and mad. all at once. so he probably wanted to show his disapointment, angryness, and depression. he didn't think of the affects due to the minor issue thst he has gone through. sorry if it doesn't . but i am trynna people.