Which Way Does a Star of About 1 M

Multiple Choice

Which way does a star of about 1 M ? evolve, on the Hertzsprung-Russell diagram, at the end of its main-sequence lifetime?

A) toward lower luminosity and higher temperature-progressing through the main sequence toward the white dwarf stage
B) toward higher luminosity and lower temperature-away from the main sequence
C) toward higher luminosity and higher temperature-upward along the main sequence
D) toward lower luminosity and temperature-downward along the main sequence