According to Mahatma Gandhi, the strongest force in the world is the non-violence of the brave. This means that those who have the courage and strength to choose non-violence as a means of resistance and change are the most powerful. Gandhi believed that non-violence was not a sign of weakness, but rather a display of strength and bravery. He advocated for non-violence as a way to bring about social and political transformation.

Option 2, non-violence of the weak, implies that only those who are physically weak choose non-violence, which is not what Gandhi believed. Option 3, non-violence of the coward, suggests that only cowards practice non-violence, which again contradicts Gandhi`s views. Option 4, non-violence of the downtrodden, while potentially true in some cases, does not specifically reflect Gandhi`s belief in the power of non-violence.