In the Hertzsprung-Russell Diagram, How Does the Position of a Typical

In the Hertzsprung-Russell diagram, how does the position of a typical star change while it is at the main-sequence phase of its evolution?

A) Stars move from upper right to lower left along the main sequence.
B) A star moves very little on the H-R diagram while it is at this phase of its life.
C) Massive stars ( > 4 M ? ) move toward the upper left as their luminosity increases, whereas lower-mass stars move toward the lower right as their temperature decreases along the main sequence.
D) Stars move from upper left to lower right along the main sequence.