What Is the Relationship Between Stellar Mass and Position on the Main

What is the relationship between stellar mass and position on the main sequence of the Hertzsprung-Russell diagram?

A) The most massive stars appear in the center of the main sequence while less massive main-sequence stars are brighter or dimmer than these stars as a consequence of their higher or lower temperatures.
B) The more massive the star, the higher up on the main sequence the star will appear.
C) The main sequence defines a line of stars whose masses are about 1 Mε , while stars of different masses appear on either side of the main sequence.
D) The less massive the star, the higher up on the main sequence the star will appear.