According to the passage, what is the problem with lignin？A．It is difficult to obtain.B．Pa

According to the passage, what is the problem with lignin？

A．It is difficult to obtain.

B．Paper cannot be made without it.

C．It causes paper to deteriorate.

D．It prevents wood from being turned into pulp.

请帮忙给出正确答案和分析，谢谢！

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