Krank and Colleagues (2005,2006)studied the Development of Alcohol and Drug

Krank and colleagues (2005,2006) studied the development of alcohol and drug use in British Columbia youth.To do this,they collected cross-sectional survey data from more than 1300 students in grades 7 to 9.For the longitudinal part of the study,they then re-tested the students once a year for the next two academic years.What is this combination of longitudinal and cross-sectional methods in one study called?

A) a cross-linkage research design
B) a cohort research design
C) a sequential research design
D) an association research design

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