During the progressive era:
(a) growing numbers of native-born white women worked in offices.
(b) the number of married women working declined.
(c) growing numbers of native-born white women worked as domestics.
(d) most eastern european immigrant women worked as telephone operators.
(e) most african-american women worked in factories.

(A) growing numbers of native-born white women worked in offices.

Explanation:

The Progressive Era was a period of social activism and political reform across the US. Progressivists wanted to end political corruption, improve the lives of individuals and protect citizens.

During this period there was a rise in the participation of women in social and political movements. Because of that a large number of native-born white women that started to work in offices and participate more in society.