"Graph A" is the one among the following stars given in the question that is most likely to end up as a supernova.
What is a supernova?
Any of a class of violently bursting stars whose brightness increases many millions of times its typical level after the eruption.
A supernova occurs when a star's nucleus, or core, undergoes a transformation. A transformation can happen in two ways, both of which result in a supernova.
As the star's nuclear fuel runs out, some of its mass is drawn into its nucleus. At that time, the star's wavelength exceeds 700 nm / s. The core eventually becomes too hefty to withstand its own gravitational attraction. The nucleus collapses, culminating in a massive supernova explosion.
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