【单选题】

What is the specific feature of fossil fuels
A．They are colorless.

B．They are odorless.
C．They are rich in carbon.
D．They are easy to freeze.

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根据网考网移动考试中心的统计，该试题：

6%的考友选择了A选项

0%的考友选择了B选项

88%的考友选择了C选项

6%的考友选择了D选项

What is the specific feature of fossil fuelsA．They are colorless.