Why Are the Results from Neurocorrelational Studies Considered Speculative

Multiple Choice

Why are the results from neurocorrelational studies considered speculative?

A) because random sampling is not used
B) because the measures used in these types of studies lack validity
C) because we cannot be certain that the behavioral tests accurately assess the actual anatomical and functional activity of the brain region under investigation
D) because correlational findings are more speculative than those acquired from experimental designs