The correct option is A Both (A) and (R) are true and (R) explains (A).
∙ Joints are junctions between bones which make movement of bones possible.
∙ There are different types of joints based on the degree of movement they permit. E.g., Hinge, ball and socket, gliding, fixed etc.
∙ Shoulder joints and hip joints can rotate upto 360 degrees. These type of joints are called ball and socket joint.
∙ This joint allows bowlers to rotate their arms 360 degress to bowl.