The quote that best illustrates the sentence "the danger of the unknown as well as the known" is:
C "The first man had his three wishes. Yes," was the reply; "I don't know what the first two were, but the third was for death. That's how I got the paw." (paragraph 33)
This quote highlights the theme of the unknown consequences of one's desires and the danger associated with making wishes, illustrating how the characters are unaware of the peril that lies ahead with the monkey's paw. The mention of the third wish being for death encapsulates the unintended and often terrifying consequences of meddling with fate.