After reading the paragraph below, answer the questions that follow.
The "Ironman" is a version of the triathlon, a race that includes three events: swimming, bicycling, and running. In an Ironman, an athlete must swim 2.4 miles, bike 112 miles, and run 26.2 miles, in that order, without a break. The annual Ironman World Championship is held in Hawaii every year. The men's course record was set in 2011 by Australia's Craig Alexander with a time of 8 hours, 18 minutes, and 37 seconds, and the women's course record was set in 2009 by England's Chrissie Wellington with a time of 8 hours, 54 minutes, and 2 seconds.
What type of energy would the leg muscles of athletes that enter this race use during the final 26.2-mile foot race?
◦ stored ATP and PCr
◦ stored ATP and PCr plus lactic acid fermentation
◦ lactic acid fermentation
◦ aerobic respiration
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