About the menisci，which is right？

About the menisci，which is right？
A.The medial meniscus is large and has a "C" shape
B.The lateral meniscus is smaller and has an "O" shape
C.Easy to be injured
D.It’s part of the knee joint
正确答案：The medial meniscus is large and has a "C" shape；The lateral meniscus is smaller and has an "O" shape；Easy to be injured；It’s part of the knee joint