In the Drake Equation (Number of Civilizations = NHP ×

Multiple Choice

In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow) , we expect the term fciv to be small if _.

A) primitive life is common but intelligent life is rare
B) most habitable planets never actually get life on them
C) most civilizations destroy themselves within just a few hundred years of arising
D) most of the civilizations that have ever existed are still out and about in the galaxy