A．Most languages with similar-sounding words seem related but are not.
B．There is limited information available about how ancient languages sounded.
C．There is more than one possible explanation for similarities among languages.
D．Eighteenth-century scholars reached an inaccurate conclusion about ancient languages.

A．Whether some languages share the common ancestor.
B．Whether a language is in the process of dying out.
C．When a certain language came into existence.
D．Why sister languages exist in the same region.

A．She is not sure what causes languages to change.
B．She does not think that languages change quickly.
C．She thinks the fact she just mentioned might be hard to believe.
D．She thinks languages evolved differently in the past than they do now.