The Sun classified as on the Hertzsprung-Russell diagram as the main sequence star.
What can we learn from the Hertzsprung-Russell diagram?
Hertzsprung-Russell diagram illustration shows the relationship between the temperature and brightness of a star that are depicted in the Hertzsprung-Russell diagram.
The H-R diagram, or color-magnitude diagram, is another name for the Hertzsprung-Russell diagram. On the Hertzsprung-Russell diagram, the Sun is classed as a main sequence star.
Therefore, option D is correct.
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