The "Ironman" Is a Version of the Triathlon, a Race

Multiple Choice

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 muscle fibers would likely be found in the legs of athletes who attempt to complete this race?

A) fast, fatigue-resistant fibers
B) fast, fatigue-susceptible fibers
C) slow, fatigue-resistant fibers
D) slow, fatigue-susceptible fibers