Determine whether the given description corresponds to an observational study or an experiment: a gallup pole surveyed 1018 adults by telephone, and 22% of them reported that they smoked cigarettes within the past week.

Most sociologists agree that: a. culture is central in shaping gender roles, but only in preliterate societies. b. biological factors have some influence, but cultural factors are more important determinants of gender roles. c. biological factors are influential in determining gender roles, but only in industrial or complex societies. d. biological factors only explain differences between men and women with regard to aggression and disease. e. there is no difference between the influences of culture or biology on the development of gender roles, as they are unpredictable.