______ refers to the phenomenon that the same word may have a set of different meanings.

A. should be confined to scientific fields
B. should resemble mathematical formulae
C. are considered artificial speech
D. may become part of common speech

A. is a famous theoretician of hypertext fiction.
B. gives an accurate definition of hypertext fiction.
C. is the author of the first major hypertext story.
D. wrote stories about husband, wife and children.