Why are scientists so much interested in 'Europa' - the fourth largest moon of the planet Jupiter?

Options :
  1. It is believed to be the last remain of a planet having collided with Jupiter.
  2. Its atmosphere is very rich in oxygen.
  3. Rocks covering its surface might date from the beginning of the Solar System.
  4. There is a remote possibility that its ice-covered oceans might harbour life.
Answer and Explanation :-

Answer: Option 4

Explanation:

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I had the feeling she was going to say something big. One of us had to say it. What happened to us? Where are we going? It was like this silence between us was frozen and we were both feeling our way around it. How is it that two people can need each other so absolutely and then, in moments, not even know how to be next to each other and just be quiet?
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