Which factor determines human beings’psychological space needs What does the author think of the American way of training people

A．shares the same view with the scientists
B．is uncertain of its occurrence
C．rejects it as being ungrounded
D．thinks that it will destroy the world soon

A．They are the same person.
B．One is a doctor and the other is a writer.
C．Both of them are teachers.
D．They are from different departments.