During maximal exercise, a 75 kg athlete aged 25 would have a
A. Heart rate nearer 200 than 150 beats/minute.
B. Stroke volume nearer 70 ml than 140 ml.
C. Tidal volume nearer 2 litres than 1 litre.
D. Blood lactate nearer 50 than 10 times the resting level.
E. Mixed venous blood oxygen content nearer 100 than 150 ml/litre.