The correct scenarios that represent pull factors of migration are:
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Nina moves to Honolulu in Hawaii because the city has a low crime rate. (This is a pull factor because it indicates a desirable aspect of the new location.)
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Valerie is moving to New York from Alabama because of better wages. (This is a pull factor because better wages are an attractive feature of the new location.)
The other scenarios listed represent push factors, as they involve leaving a location due to negative circumstances (like war, floods, or discrimination).