The Non Cooperation Movement was a significant phase in India's struggle for independence led by Mahatma Gandhi from 1920 to 1922. It aimed to build mass participation and create a united front against British rule. Several issues were prominent during this movement, and the correct answer is option 'D' - All of the above.

1. Attainment of Swaraj:
- The primary objective of the Non Cooperation Movement was to attain swaraj, meaning self-rule or complete independence from British rule.
- Mahatma Gandhi called for a nationwide movement to boycott British institutions, including schools, colleges, and law courts, to exert pressure on the colonial government.
- The goal was to weaken British rule and demonstrate the strength and determination of the Indian people.

2. Enquiry into Jalianwala Bagh Tragedy:
- The Jalianwala Bagh massacre, which took place on April 13, 1919, in Amritsar, was a brutal incident where British troops under General Dyer fired upon a peaceful gathering of Indians, resulting in hundreds of deaths.
- The Non Cooperation Movement demanded a full inquiry into the Jalianwala Bagh tragedy and the punishment of those responsible for the massacre.
- This issue became a symbol of British oppression and brutality, further fueling the movement's momentum.

3. Khilafat Issue:
- The Khilafat movement was initiated by Indian Muslims to protest against the disintegration of the Ottoman Caliphate after World War I.
- The Non Cooperation Movement incorporated the Khilafat issue to unite Hindus and Muslims in their struggle against British rule.
- It aimed to highlight the injustice faced by the Muslim community and build a broader national movement against colonialism.

By including these issues in the Non Cooperation Movement, Mahatma Gandhi aimed to mobilize a broader cross-section of Indian society and create a unified front against British rule. The movement gained significant momentum and saw widespread participation, with millions of Indians joining the boycott of British institutions and goods. However, the movement was suspended in 1922 after the Chauri Chaura incident, where protesters turned violent, leading to the death of policemen. Nonetheless, the Non Cooperation Movement played a crucial role in shaping India's independence struggle and paved the way for future mass movements.