The two 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 represents a pull factor because the low crime rate attracts her to move.)
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Valerie is moving to New York from Alabama because of better wages. (This also represents a pull factor, as the opportunity for better wages attracts her to the new location.)
The other options describe push factors, as they involve leaving a location due to adverse conditions (e.g., wars, floods, gender discrimination).