One of the Main Reasons That We Exhale a Higher

One of the main reasons that we exhale a higher percentage of carbon dioxide than we inhale is that

A) we use carbon dioxide to make glucose.
B) we produce carbon dioxide as a byproduct of aerobic respiration.
C) we produce carbon dioxide as a byproduct of transmission of nerve impulses across synapses.
D) carbon dioxide is a byproduct of photosynthesis.
E) carbon dioxide dissolves better in blood than does oxygen.