The Presence of Dusty Disks Surrounding Stars Similar to the Sun

Multiple Choice

The presence of dusty disks surrounding stars similar to the Sun was surprising because

A) such systems could not have formed planets.
B) their composition differs so much from their stars.
C) their instruments were not thought to be powerful enough to make such a measurement.
D) gas and dust should be rapidly ejected into space by the radiation from a hot star.