Who among the, following Gandhian followers was a teacher by profession?

Who among the following was called by Gandhiji as his Rajya Guru in May 1915?

Which one of the following Jails was named as ‘Mandir’ by Gandhiji?

Which one of the following was favoured by Nehru but not favoured by Gandhi?

Which one of the following sessions of Indian National Congress was for the first time attended by M.K. Gandhi:

Which of the following Round Table Conference was attended by Gandhiji?