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The Hertzsprung-Russell diagram shown here suggests that
A supergiants have a higher absolute brightness than the Sun.
B white dwarfs have a higher absolute brightness than the Sun.
C supergiants have a lower absolute magnitude than the Sun.
D white dwarfs have a lower absolute magnitude than the Sun.
The correct answer is A supergiants have a higher absolute brightness than the Sun.
Explanation: In the Hertzsprung-Russell diagram, supergiants are located at the upper left part of the diagram, indicating that they have very high absolute brightness (luminosity). The Sun, which is a main-sequence star, has a lower absolute brightness compared to supergiants. Therefore, option A is the right choice. If you have any more questions or need further assistance, feel free to ask!