When did a biological conception of race emerge?
A. A biological conception of race has always existed in all societies.
B. It is hard to pintpoint exactly, but by the 19th century (the 1800s) a view of race as something like a species had emerged.
C. A biological conception of race emerged in the past 30 years years with the development of genetic testing.
D. A biological coneption of race emerged just after World War II, when Watson and Crick first described the structure of DNA.
