(A) Proposed building a space elevator from carbon mono-filaments (X)
(B) Postulated the existence of extra-terrestrial artifacts on the moon (X)
(C) Proposed that a network of satellites in stationary orbit at very high altitudes, around the earth, be used to bounce communication signal all over the world (✔)
(D) None of these (X)
Answer: Proposed that a network of satellites in stationary orbit at very high altitudes, around the earth, be used to bounce communication signal all over the world
