Final answer:
The fibrocartilage discs located between the articulating surfaces of the knee are called menisci (option B). These C-shaped structures, consisting of the medial and lateral menisci, provide cushioning and facilitate the movement of the knee joint.
Step-by-step explanation:
The discs of fibrocartilage between the articulating surfaces of the knee are known as menisci. Specifically, within the knee joint, these structures are referred to as the medial meniscus and lateral meniscus, each being a C-shaped fibrocartilage that provides padding and helps fill the gap between the round femoral condyles and the flattened tibial condyles. They are crucial for the proper functioning of the knee, as they serve to cushion, support, and facilitate smooth movements between the femur and tibia.
While there are other structures associated with joints, such as tendons (which connect muscles to bones), ligaments (which connect bones to other bones), and bursae (fluid-filled sacs that reduce friction), the correct answer to the question is B. Menisci.