Which of the Following Statements Is Incorrect

Which of the following statements is incorrect?

A) The scientific method is a way of looking at the world that is different from non-science forms of inquiry.
B) The scientific method does not allow for the use of inferences, and everything must be proved by direct observation.
C) A theory is a tentative explanation of the behavior or properties of matter.
D) Scientists must isolate and study one variable at a time when performing experiments.
E) A behavior of matter that has universal validity is called a law.