The "Evolutionary Track" of a Star Represents

The "evolutionary track" of a star represents

A) its orbit around the center of the galaxy in which it resides.
B) changes in its luminosity and temperature, as the star ages, on a graph of these two parameters.
C) its path across Earth's sky as a consequence of its true motion in space.
D) changes in its size and mass, as the star ages, on a graph of these two parameters.