The word "registered" in the last paragraph most probably means______.

A．To play the violin un a concert.
B．To go to New York City.
C．To apply fur a scholarship.
D．To have her performance taped.

A．We have enough written record of our ancestors to prove the identity.
B．Many American slaves got to know who their ancestors were though DNA.
C．An adopted child generally lacks enough information to prove his identity.
D．Molecular genealogy can be used to prove a relationship between individuals.