The Great Atlantic Migration was largely influenced by a combination of push and pull factors. Among the options you provided, the following response forms a valid part of the theory explaining the Great Atlantic Migration:
Economic push factors in Europe resulting from crop failures.
This option highlights the economic hardships that drove people to leave Europe, while also acknowledging that there were likely pull factors, such as job opportunities and a favorable climate in the U.S. However, the economic push factors due to crop failures represent a significant reason for migration during that period.