Which of the following is least reasonable regarding the difficulty in contactin

Question

Which of the following is least reasonable regarding the difficulty in contacting extraterrestrial life using space flight and radio communication.
A) Space flight to the nearest star would take thousands of years with current technology.

Even if another intelligent civilization is within a few hundred light-years of us, conversations would be very slow with a turnaround time of decades or even centuries.

C) The spacecraft that NASA sent to Proxima Centauri a few years ago should be approaching its target within a decade or two, depending on solar wind conditions.

D) Earth has been broadcasting at radio wavelengths since the 1930's, so any civilization within a radius of 70 light-years or so could have received the broadcast by now.

E) Without some major breakthrough, interstellar space flight is totally impractical.

Explanation / Answer

D) Earth has been broadcasting at radio wavelengths since the 1930's, so any civilization within a radius of 70 light-years or so could have received the broadcast by now.

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