请选择ABC,[,s5o'@7h5n,l+C2H,~8jYour ruler is 10 _______.9_:r6e+L;P5B)W3a2p
A. mm9_:r6e+L;P5B)W3a2p
B. cm9_:r6e+L;P5B)W3a2p
C. m9_:r6e+L;P5B)W3a2p