Final answer:
To find the best fit European shoe size, convert the athlete's foot length from centimeters to the corresponding U.S. size using the size chart. The athlete's foot length of 24.5 centimeters falls between a U.S. size 8.5 and 9. Converting to European sizes, the best fit would be a European size 39.
Step-by-step explanation:
To determine which European shoe size will be the best fit for the athlete, we need to convert her foot length from centimeters to the corresponding European shoe size using the given size chart. Based on the chart, a foot length of 24.5 centimeters falls between a U.S. size 8.5 and 9.
To convert to European sizes, we can refer to the chart again. U.S. size 8.5 corresponds to a European size 39, while U.S. size 9 corresponds to a European size 40. Since 24.5 centimeters is closer to 24.6 centimeters than to 25.4 centimeters, the best fit for the athlete would be a European size 39, which is option d.