Answer:
C . from seeing the whole stadium to seeing only one lane
Step-by-step explanation:
The scene begins in the stadium of a state championship track meet with four events going on at the same time. There is a noisy crowd. At the end of the scene, the focus has narrowed to a tunnel that is occupied by Elaine's lane and the finish line. The author uses this change to give the reader a better sense of the intensity of Elaine's focus.
Hope that helped :D