Why Would a Nurse Researcher Want to Limit or Eliminate

Why would a nurse researcher want to limit or eliminate extraneous variables in a 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 the extraneous variables increases the risk for researcher bias in the study's outcome.

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