980. In thigh extension, the gluteus maximus, adductor magnus, and the hamstring muscles are the principal prime movers, the first two expecially when the thigh is flexed
450 or greater. The adductor magnus will tend to adduct the thigh unless this tendency is neutralized by the
a. Pectineus
b. Iliopsoas
c. Gluteus minimus
d. Gluteus medius