Which one of the following is not true about the First Round Table Conference?

Which of the following Indian leaders attended the First Round Table Conference in London?

The Indian National Congress did not take part in which of the following Round Table Conferences?

Who among the following had not participated in the Second Round Table Conference?

On which issue did the Second Round Table Conference fail?

At which one of the following Round Table Conferences held in London was Mahatma Gandhi present?