When the Pioneer and Voyager Spacecraft Were Launched into Space

When the Pioneer and Voyager spacecraft were launched into space in the 1970s, they were outfitted with messages describing where they came from. Why is it fairly unlikely that an alien civilization will use them to find us?

A) The extremely large distances between stars means it will take a very long time before they reach another solar system.
B) They will probably rust and fall apart as they get older.
C) They will burn up as the Sun's gravity pulls them in.
D) They will likely run into Kuiper Belt objects before they leave the Solar System.
E) They are moving so fast through space that they would be very difficult to catch.

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