![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
From Paragraph 2, we can infer all the following statements EXCEPT that______.
A.
extension of a patent's life-span is usually limited
B.
if there is no reward for a patent, extension can be granted
C.
an extension cannot be longer than 32 years
D.
few patents of invention can be granted an extension