The phrase "sound views" in the last paragraph could best be replaced by ______.

A．They did not have up-to-date ideas.
B．They were unintelligent.
C．They did not have much freedom.
D．They had no physical activity.

A．It is inaccurate but popular, compared with Hamilton's work.
B．It is accurate, but trivial compared with Hamilton's work.
C．It is admirable, but not as up-to-date as Hamilton's work.
D．It is valuable, but at a relatively low level.