Which of the Following Is NOT True

Which of the following is NOT true?

A) Principles are more useful than rules because principles can be interpreted as new circumstances require.
B) Rules are more useful than principles because rules can be interpreted as new circumstances require.
C) A blend of principles and rules is often optimal.
D) Principles are more useful than rules, and a blend of principles and rules is often optimal.
E) All of these are correct.