Observed difference of research is actually due to that manipulation only and not something else called?

Observed difference of research is actually due to that manipulation only and not something else called?
(a) Experimental validity
(b) Internal validity
(c) Control
(d) Randomization
✅ Answer: (b) Internal validity
Explanation: Internal validity confirms observed differences are caused by the independent variable.

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Results obtained from the experiments are due to manipulation of the independent variable and not due to extraneous variable is called?
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