Billy loved climbing, and he eventually suffered a brain injury due to what?\nOptions:\n- getting higher\n- loss of oxygen\n- falling\n- blisters\n- ascending
A step-by-step solution is:
loss of oxygen
Brain injury results from loss of oxygen.

Climbing can result in loss of oxygen.

Loss of oxygen is fatal.

Loss of oxygen happens in the brain.

.

The final answer: loss of oxygen