According to this passage, the umbrella was probably first invented ______.

A．The umbrella was first invented to be used as protection against the sun.
B．The umbrella changed much in style in the eighteenth century.
C．No one exactly knows who was the inventor of the umbrella.
D．In Europe, the Greeks were the first to use the umbrella.

A．Why the umbrella was so popular in Europe
B．When and how the umbrella was invented
C．the history and use of umbrella
D．the development of the umbrella