B. explain why it is more difficult to move an object at rest, than to keep an object moving
with uniform motion.

because the static friction is higher than the kinetic friction

Explanation:

Inertia is resistance to motion. Object resist changing its current motion or the rest position. This is the Newton's first law of motion

apart from this as the graph shows , the force needed to move when object at rest is higher than the force to change the motion of a moving body . this is because

static friction > kinetic friction

what is the question because that is not a question.