The correct answer is option 3: Trusteeship. The Gandhian economy was based on the principle of trusteeship, which means that wealth should be held and used as a trust for the benefit of the society. According to Gandhi, individuals who possessed more wealth had a responsibility to use it for the betterment of society and to help uplift the poor and marginalized. This principle emphasized a shift from personal ownership to a collective ownership mindset, where those who had more would willingly and selflessly contribute to the welfare of others. The idea of trusteeship aimed to bridge the gap between the rich and the poor and promote a more equal and just society. It was a departure from other economic ideologies like state control or competition, focusing instead on cooperation and the ethical use of wealth.