A．Because many architects studied with Wright.
B．Because Wright started the practice of "land-scraping".
C．Because Wright used elements of envelope building.
D．Because most of the houses Wright built were made of stone.
A．Protecting buyers of paintings.
B．Why copies of famous paintings are made.
C．How paintings are sold in the United States.
D．Protecting artists from illegal use of their work.
A．After the artwork is reviewed by lawyers.
B．After all documents are filed.
C．When the artist first gets an idea.
D．The moment the work of art is finished.