1. The problem asks to identify which part of the campers were young adults based on the bar chart data. 2. The age groups given are Senior citizens, Adults, Young adults, Teens, and Children. 3. The number of campers for each group is represented by the length of the bars on the x-axis. 4. From the data, the young adults group corresponds to the bar labeled "Young adults". 5. The number of campers in the young adults group is given as 11. 6. To express this as a fraction of the total campers, we need the total number of campers. 7. The total campers can be calculated by summing all groups: 11 (Young adults) + 20 (Adults) + 3 (Teens) + 5 (Children) + (Senior citizens not given explicitly, so assume 0 or not counted). 8. Total campers = 11 + 20 + 3 + 5 = 39. 9. The fraction of young adults is therefore $\frac{11}{39}$. 10. To convert this fraction to a percentage, multiply by 100: $$\frac{11}{39} \times 100 \approx 28.21\%$$. 11. Therefore, young adults make up approximately 28.21% of the campers. 12. The options given include 45.2% and 90%, which do not match this calculation, so the correct fraction is $\frac{11}{39}$ or about 28.21%.