It Was Recently Discovered That the Scorpius-Centaurus OB Association Passed

Multiple Choice

It was recently discovered that the Scorpius-Centaurus OB association passed within 150 light-years of the solar system perhaps 2 million years ago. What is the significance?

A) A supernova eruption in the association at that time may have sent shock waves that led to the collapse of a dark dust cloud to form the solar nebular disk.
B) A supernova eruption in the association at that time may have sent large amounts of radiation that overwhelmed Earth's protective ozone layer and caused widespread biological extinctions.
C) The gravitational influence of the association probably caused the migration of the giant planets in the solar system to their present locations.
D) A supernova eruption in the association at that time may have been the source of the radioactive aluminum isotope that was once part of some meteorites, like the Allende meteorite.