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Explanation:

In the third paragraph, the author points out, “The new free-flight concept will probably supplement the existing air traffic control system by computers on each plane to map the altitude, route, weather and other planes; and a decade from now; there will be no use of radar any more”. Therefore, the author is speaking about technology (computers on board) which will help aircrafts navigate on their own, thereby rendering radars useless.
The author does not speak about this in terms of enemy detection or range of radar. So, we can do away with options 1, 2 and 4.

Hence, the correct answer is option 3.

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