Sarah is a girl with dreams of becoming an Olympic marathon runner. She just learned that she has a rare genetic mutation and does not produce functional creatine phosphate. What portion of Sarah's marathon experience will be effected?
A. All muscle contractions after Sarah reaches fatigue (about an hour into her run)
B. All muscle contractions after Sarah reaches her maximum heart rate (about 10 minutes into her run)
C. Just the first few seconds of exercise
D. Every moment of Sarah's runs
E. No effects on her running
Answer: C
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