Bones ossified at bih: (A) Upper end of humerus, (B) Lower end of humerus, (C) Lower end of femur, (D) Lower end of tibia
Answer is C. Secondary centers around knee joint ( distal femur and proximal tibia) appear during last weeks of intrauterine life (or immediately after bih) Primary center of all tarsal bones (except talus, calcaneus and cuboid) appear after bih Ref: Gray's39e/p185-210