An unresponsive 43-year-old female was struck in the chest with a metal pipe during an assault. You observe a portion of her left chest wall moves outward when she exhales. She is taking rapid, shallow breaths. While your partner stabilizes her head, you should next:
a) Assess for signs of tension pneumothorax
b) Administer high-flow oxygen
c) Prepare for needle decompression
d) Check for signs of cardiac tamponade