Which of the following statements about spectral types of stars
is correct?
A) The spectral type of a star can be used to determine its
surface temperature.
B)The spectral type of a star can be used to determine its
color.
C) A star with spectral type A is cooler than a star with
spectral type B.
D) A star with spectral type F is hotter than a star with
spectral type G.
E) all of the above