Why is Galileo Regio, the large circular feature on Ganymede, so dark? A) It is

Question

 Why is Galileo Regio, the large circular feature on Ganymede, so dark? 

    A) It is composed of dense basaltic mantle rock that once flowed like lunar mare 

 B) It is the result of micrometeorite dust settling onto it over several billion years 

 C) It has an asphalt?like material that is like the dark side of Iapetus of Saturn 

 D) It is the result of ultraviolet light from the Sun interacting with the  

    ice and creating a dark surface. 

 E) It is the site of a recent meteorite impact that scattered a lot of dark, rocky material 

Explanation / Answer

B) It is the result of micrometeorite dust settling onto it over several billion years

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