According to the relevant provisions of the patent law, which of the following circumstances does not grant a patent right?

According to the relevant provisions of the patent law, which of the following circumstances does not grant a patent right?

A.A. invented the simulated forger.

B.b. invented a unique treatment for diabetes.

C.c. discovered a new plant variety.

D.D. invented a new method for producing plant varieties.

Correct answer: ABC