The Widmanstätten Pattern of Crystals Found in Many Iron Meteorites

The Widmanstätten pattern of crystals found in many iron meteorites is evidence that the meteorites

A) cooled slowly over many millions of years.
B) cooled quickly, in only a few years at most.
C) have suffered highly energetic collisions with asteroids or other meteorites.
D) have been subject to periodic heating by close approaches to the Sun.