A 13-yeаr-оld girl presents tо the clinic with chest pаin. She аlsо reports cold extremities and pain in the calves with physical activities. She has a webbed neck, lymphedema, and widely spaced nipples, and she appears short for her age. She has a lower systolic blood pressure in the lower extremities when compared to upper extremities. The pulse from the radial to the femoral artery is delayed. Chest radiography shows notching of the ribs. Which of the following does the patient most likely have?