Close Binary Star Systems Are Thought to Form When

Multiple Choice

Close binary star systems are thought to form when

A) two interstellar gas clouds happen to contract so close together that there's no room for a disk or planets.
B) the protostellar disk around a protostar has enough material to form a second star.
C) gravity pulls two neighboring protostars quite close together,but angular momentum causes them to orbit each other rather than colliding.
D) a protostar emits two jets,each of which turns into a star.