The Great Atlantic Migration can be explained by a combination of different factors. However, among the options provided, the following are pertinent to forming a theory regarding the migration:
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Economic pull factors in Europe due to industrial growth - This suggests that growth in industries created job opportunities that attracted people to migrate.
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Economic push factors in Europe resulting from crop failures - This implies that failures in agriculture pushed people to seek better opportunities elsewhere, including in the U.S.
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Political push factors in Europe due to governmental instability - Political instability in various European countries would have forced people to migrate in search of stability and safety.
While each of these factors plays a role in explaining the Great Atlantic Migration, they contribute to a more comprehensive understanding rather than forming a singular theory. You could argue for any of these options based on your focus, but the strongest theories generally incorporate economic push and pull factors as well as political considerations.
If you have to choose one from the list that forms a theory explaining the migration, either economic push factors in Europe resulting from crop failures or political push factors in Europe due to governmental instability are likely the strongest options, as they directly address why many people felt compelled to leave Europe.