Final answer:
The biceps femoris is the muscle that does not belong to the quadriceps femoris group; it's part of the hamstrings and functions to flex the knee.
Step-by-step explanation:
The muscle that does not belong to the quadriceps femoris group of the anterior thigh is d. biceps femoris. The quadriceps femoris group comprises four muscles that are primarily responsible for extending the knee, and these include a. rectus femoris, b. vastus lateralis, c. vastus medialis, and the vastus intermedius (not listed in the options but also part of the quadriceps group).
However, the biceps femoris is part of the hamstrings, which are located in the posterior compartment of the thigh and function to flex the knee.