Explanation:
Correct Option: C. To restore a neutral mechanical axis (a line from the center of the femoral head to the center of the ankle), the distal femur is typically cut at an angle of 5 to 7 degrees of valgus relative to its intramedullary anatomic axis. This accounts for the natural valgus bowing of the femur. (Ref: Insall et al., Clin Orthop Relat Res, 1985)