Astronomers Arrange the Stars into Groups Called Spectral Classes (Or

Multiple Choice

Astronomers arrange the stars into groups called spectral classes (or types) according to the kinds of lines they find in their spectra. These spectral classes are arranged in order of:

A) decreasing surface temperature
B) increasing mass
C) increasing amount of hydrogen
D) decreasing distance from us
E) you can't fool me, there is no order to the spectral types (that's why the letters are not in alphabetical order)