Stars on the Main Sequence with the Greatest Mass

Multiple Choice

Stars on the main sequence with the greatest mass

A) are spectral type M stars.
B) are spectral type O stars.
C) are located at the bottom of the main sequence in the H-R diagram.
D) have masses very similar to the Sun.
E) are spectral type O stars and are located at the bottom of the main sequence in the H-R diagram.