The "Rare Earth Hypothesis" Holds That Earth-Like Planets Will Prove

The "rare Earth hypothesis" holds that Earth-like planets will prove to be quite rare.Which of the following statements best sums up the current status of the debate over this hypothesis?

A) The debate raged for a while,but is now settled.We are now quite certain that Earth-like planets are common.
B) The debate raged for a while,but is now settled.We are now quite certain that Earth-like planets are rare.
C) We do not have enough data to settle the debate,because counterarguments can be made for each argument suggesting Earth-like planets may be rare.
D) It is no longer discussed,because as part of its broad cover-up of UFOs,the United States government has classified all the material relating to this debate as Top Secret.