When should a nurse researcher include an extraneous variable as part of a study's design?

ANS: B

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A Excluding extraneous variables frequently limits a study's generalizability to a larger population. This is often necessary in order to have meaningful, unambiguous study outcomes.
B If the researcher believes that an extraneous variable is important to the outcome, it should be included in the design.
C Time and financial demands should not solely influence the inclusion of extraneous variables in a study's design.
D Extraneous or mediating variables are a concern only if they may influence the outcome of a study. If a variable has no relationship to the study's outcome, it would be superfluous to include it in the study design.

that's the expression on my face when I got the notification email