A :
Sa:M0.4x60T
Sa:M0.4x16T
60T/16T=3.75
B :
Sb:M0.4x62T
Sb:M0.4x14T
62T/14T=4.43
C :
Sc:M0.4x64T
Sc:M0.4x12T
64T/12T=5.33
D :
Sd:M0.4x66T
Sd:M0.4x10T
66T/10T=6.60