Which of the Following Is an Advantage That Observational Methods

Which of the following is an advantage that observational methods have over tightly controlled experimental procedures?

A) There is greater construct validity in both naturalistic and structured observational methods than in tightly controlled experimental procedures.
B) Observational methods have minimal ethical concerns as compared to tightly controlled experimental methods.
C) There is greater generalizability in both naturalistic and structured observational methods than in tightly controlled experimental procedures.
D) Observational methods are vulnerable to participant reactivity, which is not the case in tightly controlled experimental methods.