Much of our information about pubertal development comes from J. M. Tanner's research. Which of the following most accurately represents this research? The research was conducted
a. at the turn of the century on middle-class American adolescents.
b. in the 1980s on a cross-section of North American youth.
c. during World War II on British adolescents in boarding schools.
d. in the 1960s and 1970s on British adolescents in foster homes.
Answer: d
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