What was a reason why people left family farms to move to the city?
Factory work was controlled by rigid schedules, with no slow seasons.
Factory work was easier, and the schedules were flexible.
Factory work paid wages in cash, which was not always the case on farms.

I would say the last one, Factory work paid wages in cash

Explanation: Factory work did have some confusing and complicated functions to it so B is out, and sometimes it could have times where they have low supply on materials so that could be considered having a slow season so A would be out.

factory work paid wages in cash

Explanation:

nuclear fission produces the atomic bomb, a weapon of mass destruction that uses power released by the splitting of atomic nuclei the fighting in iwo jima and okinawa affected the allies' pacific strategy because truman decided to drop the atomic bomb on mainland japan.

zheng he was a chinese explorer who lead seven great voyages on behalf of the chinese emperor. his seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433. however, most historians agree their main purpose was to promote the glory of ming dynasty china.

explanation: