Question

Some people fear that our first extra-terrestrial visitors will not be the friendly aliens envisaged in popular science fiction movies, but rather hostile invaders bent on global domination. This fear is groundless. Any alien civilization that makes it to our planet must have acquired the wisdom to control war, or it would have destroyed itself long before contacting us.
The author bases the argument above on which of the following assumptions?

पर्याय

• Our planet will have contact with extra-terrestrial visitors at some time in the future

• Interstellar travel is unworkable except in a society much more technologically advanced than ours

• A civilization that has learned to control war on its own planet will not wage war on another

• Alien civilizations are more morally advanced than those on Earth

Answer 1

A civilization that has learned to control war on its own planet will not wage war on another
Explanation:
The given argument is based on the assumption that a civilization that has learned to control war on its own planet will not wage war on another.