Is It Generally More Difficult to Draw Causal Conclusions from an Experiment

Multiple Choice

Is it generally more difficult to draw causal conclusions from an experiment or from an observational study?

A) equally difficult for both
B) from an experiment
C) from an observational study
D) from an experiment if we are studying humans, but from an observational study if we are studying the natural world
E) from an experiment if we are studying the natural world, but from an observational study if we are studying humans