Social Structure and Personality Researchers Are Interested in Establishing Causal

Social structure and personality researchers are interested in establishing causal relationships, but they rarely use experiments as a method of data collection. Why is this?

A) People won't volunteer to be in an experiment when they know it focuses on gender, race/ethnicity, or social class.
B) SSP researchers can't manipulate the independent variables they're interested in.
C) SSP researchers aren't interested in the effects of one variable on another.
D) SSP researchers are especially concerned about the consequences of deceiving their subjects.
E) The samples used in SSP research are too large to analyze experimentally.