Which of the following developmental psychologists is most well known for their work on cognitive development?

So which of the following developmental psychologists is most well known for their work on cognitive development? Let's see who is listed here. So a is Mary Ainsworth. Mary Ainsworth is very well known for her research in attachment, not so much cognitive development. So we're gonna cross that off. G Stanley Hall, one of our founders of American Psychology, he did a ton of work with adolescents, particularly with regression, as well as some evolutionary psych. So he's not like a cognition guy by any means. Next up is Jean Piaget, and Jean Piaget specialized in cognition. Absolutely. He is our big, big cognition guy in developmental psychology. He created his very famous theories, of cognitive development, which we still are talking about to this day. And then finally we have Murray Bowen here. Murray Bowen was famous for family systems theory. He did some really cool work in that. Alright, so our answer here is Jean Piaget. And there you go.