Lucy is arguing from a humanistic perspective because she suggests that people have control over their destinies.
This is an approach to psychology that focuses on the whole and uniqueness of an individual.
Hence, because Lucy is a psychology graduate student and in her argument about how environment shapes destiny, she was of the opinion that people have control over their destinies which is a humanistic view,
Read more about humanistic perspective here:
https://brainly.com/question/6964971