Why Are Extraneous Variables Limited or Eliminated in a Well-Designed

Why are extraneous variables limited or eliminated in a well-designed study?

A) More research questions would be required to define the extraneous variable.
B) Extraneous variables compete with the dependent variable as an explanation of the study's outcome.
C) Extraneous variables compete with the independent variable as an explanation of the study's outcome.
D) Manipulation of extraneous variables increases the risk for researcher bias in the study's outcome.

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