单选题 According to the passage, the specialization of art and theory has tended to

• (A) reduce the level of control artists have over artistic institutions
• (B) increase the usefulness of creating a unifying artistic vocabulary
• (C) permit a greater level of development of knowledge concerning both
• (D) curtail interactions and establish false boundaries between the two fields
• (E) complicate the educational process of artists in an unfortunate manner