Astronomers observe light from a distant galaxy and notice that its spectral lines are shifted toward longer wavelengths (redshifted). What conclusion can be drawn about the galaxy from this observation?

A) The galaxy is moving directly toward Earth, and the universe is contracting.B) The galaxy is moving away from Earth, and the universe is expanding.C) The galaxy is burning out its hydrogen fuel and cooling down.D) The galaxy is rotating faster and generating stronger gravitational forces.