Even though there is not enough background to fully understand the scene, we can infer that the time in which the woman is trying to participate in the marathon was before the women were allowed to do so. By reading that the race director got so angry at the point of entering the race to try to rip off the numbers from the woman, one can only predict that the director of the race will do whatever he can to prevent the woman to continue participating in the marathon. So the best prediction from this paragraph is:
D) Switzer will not be able to run the whole marathon.
