The Smallest Mass That a Main-Sequence Star Can Have Is

The smallest mass that a main-sequence star can have is about 0.08 solar mass.The reason for this is that

A) the temperature in the core of a contracting protostar of less than 0.08 solar masses does not get high enough for nuclear reactions to start.
B) protostars cannot form with masses less than 0.08 solar mass.
C) thermonuclear reactions begin so suddenly in stars of less than 0.08 solar mass that the star is disrupted by an explosion.
D) protostars of less than 0.08 solar masses are not massive enough to contract.