How does Angela Duckworth use reasoning to develop her argument throughout the text?
a. She analyzes individual success stories to reveal a general principle about grit.
b. She presents anecdotal evidence to uncover a universal truth about human behavior.
c. She illustrates the connection between IQ and success, and denies an influential relationship.
d. She starts with a hypothesis and narrows down predictors of success to draw her conclusion about grit.