When did Biko become the honorary president of the Black People's Convention?（）

A．Children don't show strong hand preference until six.
B．Children under three tend to have a favorite eye and ear.
C．There are as many male left-handers as female ones.
D．Left-handers are more interesting than right-handers.

A．groups of people.
B．noisy arguments.
C．subsequent events.
D．tragic happenings.