How did women change after World War 1?

they were  recruited to jobs vacated by men who had gone to fight in the war

Explanation:

Tens of thousands of women joined The Women's Land Army to work the soil, fields, and orchards to free men for military service. Women took to the land gladly and brought in the harvest during the war years to supply food to the nation, the military, and our allies.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering