Pl
look at the graph below.
a graph is shown with absolute magnitude shown on y axis and surface temperature in degree celsius shown on x axis. the dwarf stars are shown along a slanting line from coordinates 30,000 and minus 3 to 10,000 and minus 4. the main sequence stars are shown along a slanting line from coordinates 20,000 and minus 2 to 2,000 and minus 6. the giants are shown along a line parallel to the x axis from coordinates 5,000 and 2 to 2,000 and 3. the supergiants are shown along a line parallel to the x axis from coordinates 7,500 and 4 to 2,500 and 4. point a has coordinates 20,000 and minus 4. point b has coordinates 2,500 and minus 4. point c has coordinates 5,000 and 2. point d has coordinates 7,000 and 4.
which statement is true about star a?
it is red in color.
it is yellow in color.
it is four times brighter than the sun.
it is four times dimmer than the sun.