If the Lithosphere Was Not Relatively Rigid,but Rather Free-Flowing,which of the Following

Multiple Choice

If the lithosphere was not relatively rigid,but rather free-flowing,which of the following would be true?

A) The asthenosphere would be free to flow to Earth's surface.
B) Plate tectonics would not occur.
C) The temperature of Earth's surface would be hotter.
D) All of the above are correct.
E) Both a and b are correct.