The tone of the passage is ______.

A．Anomalies in theoretical physics notation permit intriguing hypotheses and indicate the need for refined notation of the time dimension.
B．New observations require the development of new theories and new methods of describing the new theories.
C．Einsteinian physics can be much improved in its treatment of tachyons.
D．Time requires a more imaginative approach than tachyons.

A．Both Tennessee William and William Faulkner are playwrights.
B．Tennessee William was a major voice who spoke for the troubled people in southern America.
C．Like Faulkner, he once won Nobel Prize for Literature.
D．Tennessee William had to pursue his writing career through difficult times.