A Researcher Conducted a True Experiment Testing Whether a Low-Sugar

A researcher conducted a true experiment testing whether a low-sugar diet versus a low-fat diet leads to a more substantial weight loss. If this experiment has high internal validity, what does it mean?

A) The participants did not know whether they were assigned to the low-sugar or low-fat diet.
B) The experiment was conducted in natural settings.
C) The experiment has established the effect of the diet type on weight-loss outcomes.
D) The results of the experiment can be generalized to the entire population.

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