A researcher compares two sets of curricular materials in order to determine which set is more pedagogically sound. In the study, which of the following factors may act as source of error ?

A researcher compares two sets of curricular materials in order to det

1.	A researcher compares two sets of curricular materials in order to determine which set is more pedagogically sound. In the study, which of the following factors may act as source of error ?
A.	Attrition
B.	Content choice bias
C.	History
D.	Subject effects
Answer» C. History

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A researcher compares two sets of curricular materials in order to determine which set is more pedagogically sound. In the study, which of the following factors may act as source of ​error ?

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A researcher compares two sets of curricular materials in order to determine which set is more pedagogically sound. In the study, which of the following factors may act as source of error ?