One of the Great Lessons Being Learned from Modern Astronomy

One of the great lessons being learned from modern astronomy is that

A) Earth occupies a unique position in the universe, and nowhere else are conditions equivalent to those in the solar system likely to be found.
B) Earth's position and circumstances in the universe are quite ordinary and certainly not unique.
C) the chemistry, geology, and physics on Earth are unique to it, and the behavior of matter anywhere else appears to be significantly different from that on Earth.
D) Earth is at the center of a very massive black hole, and all the observed cosmological effects such as redshift and cosmic background radiation and even the evolution of life are a consequence of the unique position Earth occupies.