If we do eventually make contact with other civilizations across space,which condition will inevitably hold?

Question

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The vast distances involved in space travel mean that conversations with civilizations on other planets are likely to take a very long time. Even with advanced technology, it could take years or even centuries to send and receive messages across such distances.

Answer: D
 Life as we know it is based on carbon chemistry, but it is possible that other forms of life could use different chemical processes. For example, it is theorized that some life-forms could be based on silicon chemistry. This would make communication and understanding more difficult, as we would need to develop new frameworks for understanding these life-forms.

If We Do Eventually Make Contact with Other Civilizations Across