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The correct sequence in the life cycle of a massive star is:
**D) nebula, protostar, star, super red giant, supernova, neutron star**
This sequence correctly follows the stages of a massive star's life cycle, where it first forms from a nebula, becomes a protostar, evolves into a main-sequence star, expands into a super red giant, undergoes a supernova explosion, and can end its life as a neutron star (or black hole, depending on its mass).