Which of the following statements best reflects our current knowledge about the term flife in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow?
A) The value of flife is either 0 or 1, but not anything in between.
B) The value of flife is between 0 and 1.
C) The value of flife is less than 0.0000001.
D) The value of flife is equal to 1/2.
E) The value of flife is greater than 0.9.
B) The value of flife is between 0 and 1.
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