【单选题】

Pigiron, wrought iron, and steel contain iron carbides made up of ______ of carbon.
A．(amounts are different

B．( different amounts that
C．( different amounts
D．( which amounts are different

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根据网考网移动考试中心的统计，该试题：

18%的考友选择了A选项

11%的考友选择了B选项

59%的考友选择了C选项

12%的考友选择了D选项

Pigiron, wrought iron, and steel contain iron carbides made up of ______ of carbon.A．(amounts are different