Emily Grew Up in Boston and Attends College There

Multiple Choice

Emily grew up in Boston and attends college there. She often notices clusters of people smoking outside of office buildings as she walks to class. Which of the following sources would provide the most reliable information regarding the prevalence of smoking in Boston?

A) A detailed personal study of the history of her extended family
B) Interviews with her classmates and professors
C) A review of her professor's behavioral statistics study drawn from census data
D) Observations of campus fraternity and sorority life