A Brown Dwarf Is A(n)

A brown dwarf is a(n) :

A) object intermediate between a planet and a star, with not enough mass to begin nuclear reactions in its core.
B) general name for an object similar to the planet Jupiter.
C) star whose blackbody spectrum peaks in the brown region of the visible spectrum.
D) star of less than about 1.5 solar masses at the very end of its life, after it has cooled to near invisibility.