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 M ? . The reason for this is that:

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