Why Do Some Stars in the Sky Appear Blue, Whereas

Multiple Choice

Why do some stars in the sky appear blue, whereas other stars appear red?

A) The red stars have higher surface temperatures than the blue stars.
B) The blue stars have higher surface temperatures than the red stars.
C) The blue stars are closer to us than the red stars.
D) The red stars are closer to us than the blue stars.
E) The blue stars are moving toward us, while red stars are moving away from us.