Why would Sally notice that she is breathing faster after going for a run?

a$.)$

Her body is compensating for the faster output of carbon dioxide into the bloodstream caused by running.

b$.)$

Her body is compensating for the faster output of oxygen into the bloodstream caused by running.

c$.)$

Her body is compensating for the slower intake of oxygen by the bloodstream caused by running.

d$.)$

Her body is compensating for the slower output of carbon dioxide into the bloodstream caused by running.