One Reason That Some Scientists Think That There May Be

One reason that some scientists think that there may be life under the ice-crust of Jupiter's moon Europa is that:

A) Europa is unusually warm on its surface; in some places the climate resembles Hawaii on Earth.
B) Life has already been found on Io, Jupiter's inner-most large moon
C) Life has been found on Earth, at the bottom of the ocean, deriving its energy not from sun-light but from hot mineral-laden vents coming from deeper inside our planet; something similar could happen at the bottom of the ocean on Europa
D) meteorites blasted off Europa have been found on Earth and we detect the building blocks of life inside these meteorites from Europa
E) we are receiving intriguing radio messages from Europa that indicate some form of intelligence lives there