Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova.
B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical.
C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one.
D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova.
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