This diagram represents the life track of a 1 solar mass star. Refer to the life stages labeled with roman numerals. What will happen to the star after stage viii?
A) It will continue to expand gradually until carbon fusion begins in its core.
B) It will explode as a supernova and leave a neutron star or black hole behind.
C) It will remain in stage viii for about 10 billion years, after which its outer layers will shrink back and cool.
D) Its outer layers will be ejected as a planetary nebula and its core will become a white dwarf.
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