. During a squat, your client’s knees buckle inward as she ascends. This problem is most likely due to:

  1. WEAKNESS OF THE HIP ADDUCTORS AND EXTERNAL ROTATORS
  2. WEAKNESS OF THE HIP FLEXORS
  3. WEAKNESS OF THE HIP ADDUCTORS AND INTERNAL ROTATORS
  4. WEAKNESS OF THE HIP ABDUCTORS AND EXTERNAL ROTATORS