The correct answer is: a) Lahore
Lahore was a major center of activity during the Civil Disobedience Movement. The city was home to a number of prominent Indian nationalists, including Mahatma Gandhi and Jawaharlal Nehru. Lahore was also the site of a number of important protests and demonstrations during the movement.
In 1930, Gandhi led a march to Lahore to protest the British salt monopoly. The march, which was known as the Salt March, was a major turning point in the Civil Disobedience Movement. It helped to galvanize support for the movement and led to a number of other protests and demonstrations across India.
Lahore was also the site of the Lahore Resolution, which was passed in 1940. The resolution called for the creation of a separate Muslim state in India. The resolution was a major turning point in the history of India and led to the partition of India in 1947.
The other options are incorrect because they were not major centers of activity during the Civil Disobedience Movement. Amritsar is a city in Punjab that is known for the Jallianwala Bagh massacre, which took place in 1919. Ludhiana is a city in Punjab that is known for its textile industry. Patiala is a city in Punjab that was the capital of the princely state of Patiala.