Question

A major change women experienced during the post-World War I era was that they started
wearing longer hemlines.
dancing and drinking alcohol.
driving cars and trucks.
working outside the home.

Answer 1

working outside the home.

During and after WWI many women entered paid employment in factories, offices, and other jobs previously held by men. This expansion of women's work outside the home was a major social change (along with political gains like suffrage).