You are treating a 40-year-old female patient who was entrapped after a building collapse. The patient is awake and alert with a patent airway; non-labored breathing; weak, rapid regular radial pulses; breath sounds are clear and equal; stable pelvis; delayed capillary refill in both lower extremities; numbness and tingling in her left lower extremity; and, swelling in her right lower extremity. Which of the patient's signs is a late sign of crush injury?
a) Weak radial pulses
b) Breath sounds clear and equal
c) Delayed capillary refill
d) Numbness and tingling in the left lower extremity