The correct answer is option 'D' - Civil Disobedience Movement.

Explanation:
The Civil Disobedience Movement was a significant phase of the Indian National Movement. It was launched by Mahatma Gandhi in 1930 to protest against the oppressive British colonial rule and demand independence for India. This movement witnessed the participation of women in large numbers for the first time, making it a significant milestone in the history of women's participation in the Indian National Movement.

Below are the key points explaining why the Civil Disobedience Movement witnessed the participation of women in large numbers:

1. Empowerment through Non-cooperation Movement:
During the Non-Cooperation Movement (1920-1922), women actively participated in various activities like picketing liquor shops, boycotting foreign goods, and promoting the use of khadi (hand-spun cloth). This movement played a crucial role in empowering women and encouraging their active involvement in the nationalist movement.

2. Inspiration from Nationalist Ideals:
The nationalist ideals propagated during the Indian National Movement, such as freedom, equality, and justice, deeply resonated with women. They were inspired by the idea of a free and independent India and actively joined the Civil Disobedience Movement to contribute to the cause.

3. Participation in Salt Satyagraha:
One of the significant events of the Civil Disobedience Movement was the Salt Satyagraha, where people across the country marched to the seashore to make their own salt in defiance of the British Salt Laws. Women played a crucial role in this protest by participating in the Salt Marches, manufacturing illegal salt, and supporting the movement in various ways.

4. Active Role in Protests and Demonstrations:
Women actively participated in various forms of protests and demonstrations during the Civil Disobedience Movement. They organized and participated in rallies, processions, and public meetings to voice their opposition to British rule and demand independence.

5. Contribution as Volunteers:
Women also volunteered in large numbers to support the movement. They worked as fundraisers, propagandists, and educators, spreading the message of the movement and mobilizing public support.

6. Symbolic Role in the Movement:
Women's participation in the Civil Disobedience Movement challenged traditional gender roles and norms. Their active involvement sent a powerful message of women's agency, breaking the stereotype of women as passive supporters and highlighting their potential as leaders and change-makers.

In conclusion, the Civil Disobedience Movement witnessed the participation of women in large numbers for the first time in the Indian National Movement. Their active involvement in various activities and protests played a significant role in shaping the movement and highlighting the importance of women's participation in the struggle for independence.