[单项选择]Modern technology and science have produced a wealth of new materials and new ways of using old materials. For the artist this means wider opportunities. There is no doubt that the limitations of materials and nature of tools both restrict and shape a man’’s work. Observe how the development of plastics and light metals along with new methods of welding has changed the direction of sculpture. Transparent plastic materials allow one to look through an object, to see its various sides superimposed on each other (as in Cubism or in an X-ray). Today, welding is as prevalent as casting was in the past. This new method encourages open designs, where surrounding and intervening space becomes as important as form itself. 　　More ambiguous than other scientific inventions familiar to modern artists, but no less influential, are the psychoanalytic studies of Freud and his followers, discoveries that have infiltrated recent art, especially Surrealism (超现实主义). The Surrealists, in their struggle to
A. are responsible for most of the changes in sculpture arts.
B. enable sculptors to superimpose multiple sides of their designs.
C. permit details of an object to be magnified and seen clearly.
D. provoke artists to make themselves adaptable to the surroundings.