The correct answer is b) joint or d) articulation.
A joint, also known as an articulation, is the area where two or more bones meet. Joints are essential for providing support and enabling movement in the body. They can be classified into different types based on their structure and the movement they allow, such as hinge joints, ball-and-socket joints, and more.
While options a) cavity and c) contusion do refer to certain aspects of anatomy, they do not define the meeting point of bones. A cavity may refer to a hollow space within a bone, and a contusion is a type of bruise that can occur in soft tissue, not directly related to the connection of bones.