While Sirius, the Dog Star, is type AO, a start just a step hotter than M0 is a related what?

A.M1
B.K9
C.F5
D.AOK
E.B9

B. K9

K9 is followed by M0 in the temperature/spectral classification of stars. K's are hotter than M's, and K9 is the coolest of the K's

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