In 1920, which of the following changed its name to "Swarajya Sabha"?

1. A

   All India Home Rule League

   (a) All India Home Rule League. In 1920 Gandhi took the presidency of Annie Besant’s Home Rule League and the organisation was renamed Swarajya Sabha. That is the name-change asked. This option is the official key.

2. B

   Hindu Mahasabha

   (b) Hindu Mahasabha. Founded in the 1910s, it did not become “Swarajya Sabha” in 1920. This option is not the key.

3. C

   South Indian Liberal Federation

   (c) South Indian Liberal Federation. The Justice Party’s formal name; it remained a non-Brahmin Madras body, not Swarajya Sabha. This option is not the key.

4. D

   The Servants of India Society

   (d) The Servants of India Society. Gokhale’s 1905 society kept its name; it was not rebranded in 1920. This option is not the key.

Summary. Official key is (a) All India Home Rule League. The 1920 relabelling as Swarajya Sabha marks Gandhi’s takeover of Besant’s League on the eve of Non-Cooperation. Hindu Mahasabha, the Justice Party and the Servants of India Society followed other paths and names. Only the Home Rule League matches the question. That is letter (a).