Rockey is a guy college student who is 22 years old. He runs for fun, but he wants to improve his time in a future 10-kilometer race. In order for him to train the proper energy system, what range of work-to-rest ratios will you suggest to him?
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A
1:3 to 1:4
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B
1:3 to 1:5
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C
1:1 to 1:3
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D
1:12 to 1:20