If We Are Optimistic in Our Assumptions About the Development

Multiple Choice

If we are optimistic in our assumptions about the development of life and intelligence, thenthe number of technological civilizations in the galaxy should equal the:

A) average lifetime of a civilization.
B) number of stars forming per year.
C) average number of planets per star.
D) number of stars in the galaxy's habitable zone.
E) average number of planets that produce life.