Where Have Some Scientists Hypothesized That They Have Found Direct

Where have some scientists hypothesized that they have found direct evidence for life,either contemporary or ancient,beyond Earth (although the hypothesis has been strongly disputed by many other scientists) ?

A) in spectra of the dark deposits along fissures in the ice of Jupiter's satellite Europa
B) in "orange soil" found on the Moon
C) in the "soil" (regolith) at the Viking 2 landing site on Mars
D) in a meteorite composed of ancient Martian rock