The correct option is C Uniformly accelerated motion
According to the graph, the velocity of the body changes linearly with respect to time. The rate of change of velocity, or acceleration of the body is constant. Hence, it's an example of a uniformly accelerated motion.
If rate of change of distance with respect to time is constant, the motion is said to be a uniform motion or uniform velocity motion. Here the body is changing its velocity with time so it is not an uniform motion.