Which of the Following Statements About Runner's Knee Is True

Which of the following statements about runner's knee is true?

A) Men are more commonly affected than women.
B) The main symptom is the pain that is experienced when downward pressure is applied to the patella after the knee is straightened fully.
C) Runners should increase activities that put compressive forces on the patella.
D) Runner's knee involves abnormal movement of the feet while exercising.