Option 1: The members of the Swaraj Party were Motilal Nehru and Sardar Patel. This means that option 1 is incorrect as it includes both of these members.

Option 2: The correct answer is option 2. According to the question, only one member, Motilal Nehru, was a part of the Swaraj Party. Therefore, option 2 correctly states that Motilal Nehru (a) was a member of the Swaraj Party, while Sardar Patel (b) was not.

Option 3: This option suggests that both Sardar Patel (b) and Gopal Krishna Gokhale (c) were members of the Swaraj Party. However, according to the question, only Motilal Nehru was a member of the Swaraj Party. Therefore, option 3 is incorrect.

Option 4: This option includes all three members mentioned in the question, namely Motilal Nehru (a), Sardar Patel (b), and Gopal Krishna Gokhale (c). However, according to the question, only Motilal Nehru was a member of the Swaraj Party. Therefore, option 4 is incorrect.

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