The Existence of Distinct and Separate Types of Meteorites, Stony

The existence of distinct and separate types of meteorites, stony, stony iron, and iron, is probably a result of

A) differentiation of material in molten asteroid interiors, with the iron sinking to the core, followed by fragmentation and separation of the iron core and rocky shell.
B) preferential accretion of iron particles to other iron particles because of their magnetic properties, leaving stony particles to accrete separately.
C) different amounts of heating and "erosion" of the outer layers of meteorites as they pass through Earth's atmosphere; the irons lose their outer rocky shells.
D) their formation in different parts of the early solar nebula, with stones condensing closer to the Sun and irons condensing farther away from the Sun.