Extraneous variables are essentially

AIndependent variables that are not part of the study's focus ✓ Correct

BDependent variables

CNeither independent nor related to the outcome

DConstants that never change

Correct answer: (A) Independent variables that are not part of the study's focus

Explanation

Extraneous variables are essentially independent variables that lie outside the study's intended focus.

They can influence the outcome and so must be controlled to protect validity.

Calling them dependent variables is wrong, since they are potential causes, not the measured effect.

Saying they are neither independent nor related to the outcome contradicts their power to affect it.

Treating them as constants that never change misses that they do vary and can bias results.

An uncontrolled extraneous variable that covaries with the treatment becomes a confound.

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