Answer:
3. The ratio 15:73 represents the ratio of 7th grade football players to total athletes.
Explanation:
The ratio 15:73 represents the ratio of 7th grade football players to total athletes. This is because there are 15 football players in the 7th grade and a total of 73 athletes across all grades and sports. So, the correct answer is option 3. The ratio 15:73 represents the ratio of 7th grade football players to total athletes.