Which Statement BEST Compares the Knee Extensor Muscle Group with the Flexor

Which statement BEST compares the knee extensor muscle group with the flexor muscle group?

A) Flexors able to produce two thirds greater force than extensors
B) Able to generate equal amounts of maximal force
C) Extensors able to produce two thirds greater force than flexors
D) Able to generate comparable force depending on patellar position