The following sentences tell what happened many years ago. Which is the right order of the events（）

A．Archimedes took a bath
B．Archimedes discovered his principle
C．The king of Syracuse asked him to sovle a problem
D．Archimedes did the experiment on his crownA. c;a;b;dB.b;c;a;dC. b;c;d;aD. c;a;d;b