The correct option is A Issue of separate electorate for minorities.
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Gandhiji was the only Congress member who attended the Second Round Table Conference, where the separate electorate for minorities had become the main topic. Gandhiji did not welcome this, claiming that the Congress represented all of India, and the untouchables were Hindus and should not be treated as a minority. He also said that there should be no separate electorates for Muslims or other minorities. The other Indian participants rejected these claims. Due to such disagreements, the Second Round Table Conference was deemed a failure.