Answer:
D. It may be similar to Earth's early conditions.
Step-by-step explanation:
Titan is one of the many satellites orbiting planet saturn. This satellite is very interesting as it shows a lot of similarities with the conditions at play when the early earth formed.
The early earth atmosphere was made up of reduced gases lacking in oxygen. Titan's atmosphere also share this similarity. It's atmosphere is predominantly made up of nitrogen, methane and carbon dioxide.
Titan also has a rocky surface just like earth and it has an atmospheric cover.