How Are Threats to Validity Affected When Studies Are Conducted

How are threats to validity affected when studies are conducted in real-world settings?

A) Threats to both internal and external validity are increased.
B) Threats to both internal and external validity are decreased.
C) Threats to internal validity are decreased, whereas threats to external validity are increased.
D) Threats to internal validity are increased, while threats to external validity are decreased.

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