If Humans Do Eventually Make Contact with Other Civilizations in the Milky

Multiple Choice

If humans do eventually make contact with other civilizations in the Milky Way, which of these conditions will inevitably hold?

A) Humans will not be able to understand the messages.
B) The civilization is likely to be very much more technologically primitive than ours.
C) Conversations will take a very long time.
D) The chemistry and biology of the life-forms are likely to be very different from ours-for example, silicon-based rather than carbon-based.