"Look, your worship,” said Sancho; “what we see there are not giants but windmills, and what seem to be their arms are the sails that turned by the wind make the millstone go.” “It is easy to see,” replied Don Quixote, “that thou art not used to this business of adventures; those are giants; and if thou art afraid, away with thee out of this and betake thyself to prayer while I engage them in fierce and unequal combat."

What theme is illustrated in this excerpt from Cervantes’s Don Quixote?
A. man versus nature
B.fantasy versus reality
C.tradition versus change
D. individual versus society