Which of the Following Distinguishes the Correlational Method from Experimentation

Which of the following distinguishes the correlational method from experimentation?

A) the correlational method uses fewer participants
B) no attempt is made to systematically manipulate one or more factors with the correlational method
C) the correlational method enables researchers to study social attitudes
D) the findings from the correlational method are more likely to be contaminated by the researcher's values
E) both a and b