Becky babysits two sisters, jasmin and erum. last week when the two girls were eating cookies, jasmin complained about how 'unfair' it was that erum had more cookies than her. to solve the problem becky took one of jasmin's cookies and divided it in half. jasmin then thought that the cookies were equal between her and her sister and was happy. several months later becky is babysitting them again. she fixed the girls brownies and jasmin again complained that her sister had more brownies than her. becky divided one of jasmin's brownies in half and asked her if it was now fair. jasmin replied, "no, all you did was cut it in half." jasmin is now in which stage of cognitive development according to piaget's theory?