When ligaments are torn, the stability of the joint they serve is compromised, leading to increased mobility beyond the normal range, which can cause pain and instability. Therefore, the correct answer is:

Option B: Bone less movable at joint and pain.

This is because ligaments are tough, elastic bands of connective tissue that surround a joint to give support and limit the joint's movement. When ligaments are damaged, it can lead to pain, swelling, and a reduced ability to move the joint, contrary to the joint becoming more movable without pain or the bones moving freely without any discomfort. Ligaments provide stability to the joints, so their injury typically results in instability and pain due to the loss of this support and limitation of movement.