Runners only have enough stored ATP in their muscle cells to run for about five seconds. Which answer correctly explains how the runner's body adjusts to the longer distance, for example, a marathon (42.1 km)? Question 17 options:

The runner's body will create the needed energy by breaking down proteins.

The runner's body will produce the energy by activating the Golgi apparatus.

The runner's body will supply the needed energy by producing starch.

The runner's body will convert stored fat molecules into energy.