Answer:
C
Explanation:
<u>The greenhouse effect is a natural process that warms the Earth's surface. </u>
The riddle which says the one who built have not used it before, and the user has never for once seen it, is Coffin.
- This statement can be regarded as a riddle, which is a question, phrase that can be termed to different meaning it is puzzle that needed to be solved.
- Coffin here are used for human remains , and the maker of has not used it before because he still alive.
Therefore, a Riddle is a way to test our ability to reason in different ways.
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