The correct answer is option 1: Both A and R are true, and R is the correct explanation of A. This is because the assertion (A), stating that Gandhi stopped the Non-Cooperation Movement in 1922, is indeed accurate. The Non-Cooperation Movement was a key part of India`s struggle for independence and was indeed halted by Gandhi in 1922. The reasoning (R), stating that Gandhi stopped the movement due to the violence at Chauri-Chaura, is also true and accurately explains why Assertion A occurred. The incident at Chauri-Chaura involved a violent clash between protesters and police, which led to the deaths of numerous police officers. This incident greatly disturbed Gandhi, who strongly believed in non-violence, and led him to stop the movement. Therefore, both the assertion and reason are accurate, and the reason correctly explains the assertion. Options 2, 3, and 4 are inaccurate in this context.