Answer:
D. The only known source of methane on solar system bodies is from volcanism.
Step-by-step explanation:
- As the energy from the sun could have converted all the terraces of the methane in the titan atmosphere which is more amount of hydrocarbons within a period of 50 million years compared to the solar system the methane thus was replenished by the reservoir deep within the titan itself as the moon lies in the 95% of magnetosphere of the Saturn its interior atmosphere release methane in the form of cryovolcanoes.