The Most Important Fact About a Cluster of Stars That

Multiple Choice

The most important fact about a cluster of stars that makes them useful for studying starformation is that:

A) all the stars formed from the same cloud.
B) all the stars formed at about the same time.
C) all the stars are at the same distance from Earth.
D) all the stars have the same chemical composition.
E) all the stars are the same spectral type.