In a Within-Subjects Design,the Term "Participant Attrition" Refers to the Possibility

In a within-subjects design,the term "participant attrition" refers to the possibility that ____.

A) ​the scores may differ from one treatment to another because of outside events
B) the scores may differ from one treatment to another because of changes in the?measuring instrument
C) the scores may differ from one treatment to another because the participants gain?experience in each treatment
D) ​some of the individuals in the study may leave without completing all of the treatment
Conditions

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