What Idea Does the Functionalist Architecture of Le Corbusier Promote

What idea does the functionalist architecture of Le Corbusier promote?

A) Buildings should be built without ornamentation and instead be practical structures with clean, straight lines.
B) Buildings should reflect their surrounding environment, imitating the forms and designs of nature.
C) Buildings should imitate classical forms that emphasized harmony and balance.
D) Buildings should express the mood of the architect in reaction to the society around him.