Which one of the following artists is NOT a man

A．To discuss different concepts.
B．To introduce a new methodology.
C．To talk about conceptual systems.
D．To introduce a research paper.

A．began to build a monumental building together with Walter Chrysler.
B．joined in the construction of a tall building along with Walter Chrysler.
C．kept a secret of his own skyscraper while he joined Walter Chrysler.
D．did not know how taller his building would be than Walter Chrysler's.