B. She whimsically changes her mind about whom she supports.
Explanation:
Geoffrey Chaucer's "The Canterbury Tales" contain a collection of tales told by the pilgrims on their way to Canterbury. The Monk's tale is one among the others who were made to tell stories so as to pass the time.
In Monk's tale, the theme focus on how fortune affects a man's life. The fickleness of fortune, the temporary nature of its generosity and interest in a man is what the monk wants to warn the others. And in his tale, the Monk reveals that one trait of Fortune is that she whimsically supports and then changes her mind about the person she favors without no warning. He states <em>"whan that Fortune list to flee, / Ther may no man the cours of hire withholde. / Lat no man truste on blynd prosperitee"</em>.
By saying that, he indicates that they know each other very well and that without talking, they have similar ideas and outlooks on the world in response to certain situations.
