Despite a vigorous training schedule and careful meal planning, anthony "hit the wall" at mile 12 of his half-marathon and he had to walk the last mile. to what can his inability to finish the race most likely be attributed? depletion of fatty acids not enough fans cheering him on depletion of glycogen overproduction of insulin

The correct answer is depletion of glycogen.

A depletion of glycogen or blood glucose levels most likely caused Anthony to not be able to finish the race. His blood glucose level likely fell due to a depletion in his liver glycogen. A depletion in liver glycogen causes a decline in energy needed for a physically taxing task such as running. In this case, Anthony was only able to walk and not run at mile12 of the race since his glycogen levels fell.