A 24-year-old male repos that during a game of hoops (basketball), he tripped while driving the ball to the basket, and fell on his outstretched right hand with the palm down. Three days later, patient presented to the OPD with right wrist pain. On examination, the wrist was slightly swollen and tender but without deformity. The doctor instructed the patient to extend the right thumb, thereby accentuating the anatomical "snuffbox," which is extremely tender to deep palpation. The doctor advised to get a x ray of the wrist done. What is the most likely injured pa?