Which of the following options BEST explains the pesticide paradox principle of testing?

Which of the following options BEST explains the pesticide paradox principle of testing?
A . If we do not regularly review and revise our tests, we’ll stop finding defects.
B . Repeatedly running a set of tests will ensure that a system is defect free.
C . Defects are, paradoxically, often contained in a small number of modules.
D . Testing, like spraying pesticide, is an effective bug/defect removal activity.

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Answer: C