What does the term “Pesticide paradox” refer to?

What does the term “Pesticide paradox” refer to?
A . The phenomena where a piece of code that has a lot of bugs is likely to have more hidden, yet unfound bugs
B . The decreasing efficiency of debugging when done in code that has many bugs
C . Reduced effectiveness of test cases that are repeated and focused on the same scenarios
D . The redundancy of testing the same objects in both black and white box techniques

Answer: C