Why Would a Researcher Interested in Making a Causal Claim

Multiple Choice

Why would a researcher interested in making a causal claim NOT do an experiment?

A) Experiments are very expensive and the researcher might not have grant funding.
B) There may be ethical limitations of manipulating a variable.
C) Laboratory space is required for experiments and the researcher might not have a lab.
D) Experiments take longer to do than other types of studies.