Answer
The match for 28 is "i". This are the hamstring muscles. The term hamstring muscles includes the biceps femoris, the semitendinosus, and the semimembranosus muscles. They flex the knee joint, and extend the thigh backward.
Work Step by Step
The biceps femoris also elevates the trunk from a stooping position, and rotates the tibia on the femur. The semimembranosus also rotates the femur when the hip is extended.