A Bright,extended Object Appears in the Sky One Evening,visible to the Naked

Multiple Choice

A bright,extended object appears in the sky one evening,visible to the naked eye.Over the next several weeks,it moves across the sky,becoming brighter as it approaches the Sun and then fainter again as it moves away.After six weeks,it fades away.This is most likely a(n) :

A) supernova.
B) Earth-crossing asteroid.
C) Trojan asteroid.
D) comet.