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In a well-controlled laboratory environment, the typical outcomes regarding internal and external validity are as follows:
- **High internal validity**: This means that the study can effectively demonstrate a cause-and-effect relationship due to the control of confounding variables.
- **Low external validity**: This indicates that the findings of the study may not generalize well to real-world situations, as laboratory settings can differ significantly from real-world conditions.
Based on this reasoning, the correct answer is:
**B. High internal validity and low external validity.**