Final answer:
The action of the hip adductor muscle is adduction of the hip. The adductor longus, adductor brevis, and adductor magnus muscles are involved in adducting the hip, which means they move the thigh towards the midline of the body.
Step-by-step explanation:
The action of the hip adductor muscle is 4) Adduction of the hip.
The adductor longus, adductor brevis, and adductor magnus are the main muscles involved in adducting the hip, which means they move the thigh towards the midline of the body.
For example, when you bring your legs together, you are using your hip adductor muscles to adduct the hips.