Flexion at the Knee Involves ________

Flexion at the knee involves ________.

A) isotonic contraction of both the hamstring group and the quadriceps femoris group
B) eccentric contraction of the hamstring group and concentric contraction of the quadriceps femoris group
C) concentric contraction of the hamstring group and eccentric contraction of the quadriceps femoris group
D) isometric contraction of the hamstring group and isotonic contraction of the quadriceps femoris group