Answer the following question given this paragraph: A star like our Sun will become a red giant in its next stage. When a star uses up its hydrogen, it begins to fuse helium atoms. Helium fuses into heavier atoms like carbon. At this time the star's core starts to collapse inward. The star's outer layers spread out and cool. The result is a larger star that is cooler on the surface, and red in color. Q: What is our sun's next stage called? Choices: - blue giant - white giant - super nova - red giant A:
red giant