C

Step 1: Identify the nature of the displacement-time graphs.
In graph (i), the curve is concave upwards, indicating that the velocity of the particle is increasing over time. This is characteristic of uniformly accelerated motion.

Step 2: Analyze graph (ii).
The curve in graph (ii) is also concave but appears to be leveling off. This indicates that the velocity of the particle is decreasing over time, which is characteristic of uniformly retarded motion.

Conclusion:
Therefore, particle (i) exhibits uniformly accelerated motion and particle (ii) exhibits uniformly retarded motion. Therefore, the correct answer is C.