Answer:
D. They both caused the forced removal of American Indians from their land to move west.
Explanation:
Participants' understanding of the purpose of the study is an example of a sensitization effect.
<h3 /><h3>What is the sensitization effect?</h3>
Corresponds to the increase in an individual's response when he is subjected to repetition of a given stimulus.
Therefore, sensitization is an effect that can occur in research, being characterized as a non-associative learning process.
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A quote from George Bernard Shaw
Explanation: George Bernard Shaw (1856-1950) was an Irish playwright and novelist. Nobel Prize for Literature in 1925.