The title that best expresses the ideas of this passage is ______.

A．is non-existent
B．is that the latter needs confirmation
C．rests on tile simplicity of the former
D．is the difference between the modern scientists and the ancient Greeks

A．modern scientists and the ancient philosophers used similar techniques
B．the difference between inductive and deductive reasoning is non-existent
C．the ancient philosophers and scientists were primarily interested in "theories"
D．it is easy to convert "theory" into fact