Question

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why do scientists think the exoplanet k2-18b might be home to alien life?
a its located about 730 trillion miles from earth.
b its atmosphere appears to contain high levels of dimethyl sulfide.
c the james webb space telescope captured images of plankton in its oceans.
d all of the above

Explanation:

Dimethyl sulfide is often associated with biological processes on Earth. High levels of it in the atmosphere of K2 - 18b suggest the possible presence of life - related processes. Distance from Earth (A) is not an indicator of life presence. And no images of plankton in its oceans have been captured by the James Webb Space Telescope (C is incorrect).

Answer:

B. Its atmosphere appears to contain high levels of dimethyl sulfide.