Answer:
Animism
Step-by-step explanation:
In the context of Jean Piaget's cognitive development, animism is children's belief that their toys are alive. More specifically, animism occurs during the preoperational stage, when children are at the age of two until seven.
Olivia, as a child who is still at this stage of cognitive development, lacks the ability to use logic - although it understands symbolic thoughts. Since she held the belief of animism, Olivia thinks that Max is just like her, and thus she can blame her toy train for the things that occur to her - which is also an indicator of egocentrism, another aspect of this stage.