[单选题]
A spirometer is an apf4(thb a3z a8t;pk x)iparatus e :pi.wqq p*w6that measures the volume of air (dm$^3$ ) inhaled and exhaled over a period of time. The graph below shows the spirometer reading of an individual after exercise.
What would the spirometer reading look like for an individual at rest who has not recently exercised?
A. Tidal volume would be higher
B. Volume of air inhaled and exhaled per breath would be the same
C. Decrease in ventilation rate
D. Graph would appear linear without fluctuations