单项选择题

Which of the following orders is true
 

A.Archimedes took a bath.
B.Archimedes discovered his principle.
C.The King of Syracuse asked him to solve a problem.
D.Archimedes did the experiment on the crown.A. b,c,a,dB. c,a,b,dC. c,a,d,bD. b,c,d,a