Which of the following sentences describes one of these basic principles?

In foundation level syllabus you will find the main basic principles of testing.

Which of the following sentences describes one of these basic principles?
A . Complete testing of software is attainable if you have enough resources and test tools
B . For a software system, it is not possible, under normal conditions, to test all input and output combinations
C . A goal of testing is to show that the software is defect free
D . With automated testing you can make statements with more confidence about the quality of a product than with manual testing

Answer: B