Explanation:

Let’s break it down:

- Option 1: Dacca – This is actually where the *first session* of the All-India Muslim League was held, back in 1906. They chose Dacca (now Dhaka, in Bangladesh) to represent the interests of Muslims in British India.

- Option 2: Calcutta – The League did hold a session in Calcutta, but it wasn’t the first.

- Option 3: Lahore – Important city for the League, especially for the 1940 Lahore Resolution, but not the site of the first session.

- Option 4: Karachi (1907) – Karachi hosted the League’s session in 1907, but by then, the first session had already happened a year earlier in Dacca.

So the answer is Dacca, not Karachi. The very first meeting where the Muslim League kicked off took place in Dacca in 1906.