Which of the Following Statements BEST Describes the Function of the Patella

Which of the following statements BEST describes the function of the patella at the knee?

A) Increases moment arm of quadriceps muscles, most effectively from 60° to 30° extension
B) Increases weight-bearing surface of the knee joint
C) Increases moment arm of quadriceps muscles, most effectively at terminal knee extension
D) Sesamoid bone that has little specific function