Some Protostars, When They Evolve onto the Main Sequence, Employ

Some protostars, when they evolve onto the main sequence, employ convection to carry material outward from the core to some region midway through the star. Radiation then carries the energy outward to the surface. Which stars show this characteristic?

A) only the smallest, with masses less than about 0.4 M ?
B) intermediate masses, from about 0.4M ? up to about 4 M ?
C) the largest, with masses above about 4 M ?
D) all of them

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