Which of the following lists the correct order of the life cycle of massive stars? a. Nebula --> protostar --> main sequence --> red supergiant --> supernova --> blackhole
b. Nebula --> protostar --> main sequence --> red giant --> planetary nebula --> white dwarf --> black dwarf
c. Nebula --> protostar --> main sequence --> supernova --> red giant --> blackhole
d. Nebula --> protostar --> blackhole --> red supergiant --> supernova --> main sequence