Which of the sentences below best expresses the essential information in the highlighted s

Which of the sentences below best expresses the essential information in the highlighted sentence in the passage？ Incorrect choices change the meaning in important ways or leave out essential information.

A．If an idea is published, another similar patent following it cannot be applied any more.

B．The same idea can only be patented once in an area, so it is safe to use an idea of another area.

C．A lot of inventors plagiarize ideas in the same area, so it is wiser to choose ideas in another different area.

D．Traditionally, a lot of inventors re-patent other"s dead patents, so this kind of activity becomes safe.

请帮忙给出正确答案和分析，谢谢！