SAT Question 5ccbfe22: Words In Context answer and explanation

English - Words In Context - Fill In Blank Multi Word Phrase
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To entice study participants, psychology researchers commonly offer a gift card or other compensation. However, this practice may undercut the applicability of the study’s results: people who join a study in response to ______ may differ in important ways from a representative sample of the population of interest.
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Difficulty:Hard
Which choice completes the text with the most logical and precise word or phrase?