The author mentions all of the following ways to measure time EXCEPT ______.

A．The development of Universal Time.
B．Different ways to measure time.
C．Why we measure time the way we do.
D．How the calendar came into being.

A．Time measurements have changed in response to need and technological development.
B．In ancient Babylonia, 12 was the basic division of time.
C．The first calendar was developed because the sages of tribes were intelligent.
D．Universal Time is so named because it is applicable throughout the universe.