单选题 The author offers all of the following ideas as proof that there is no direct correspondence between words and things EXCEPT

• (A) Language has other functions than that of reference.
• (B) Once a word is grouped into a class, no one-to-one correspondence exists between it and what it signifies.
• (C) Many words refer to objects that do not exist in the world.
• (D) Function words do not refer to objects.
• (E) Proper nouns usually refer to unique entities.