A main-sequence star can be no smaller than 0.08 solar mass.The reason is that:
A) thermonuclear reactions begin so suddenly in stars of less than 0.08 solar mass that the star is disrupted by an explosion.
B) protostars of less than 0.08 solar mass cannot form.
C) protostars of less than 0.08 solar mass are not massive enough to contract.
D) the temperature in a contracting protostar of less than 0.08 solar mass does not become high enough for nuclear reactions to start.
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