Which statement best explains how the rhetorical device supports the central idea?
a) the author uses a rhetorical question to make the old gentleman seem ridiculous.
b) the author uses an allusion to refer to a well-known expert, showing that the central idea is valid.
c) the author reinforces the central idea by understating the wise thoughts of the old gentleman.
d) the author emphasizes the central idea by showing the old man’s foolishness through his use of overstatement.