Given:
The number of tickets sold to children

The number of tickets sold to adults

The number of tickets sold to seniors

To determine the percentage of tickets sold to seniors we need to determine the total number of tickets sold to each category.
To determine the percentage of tickets sold to seniors:
In order to determine the percentage of tickets sold to the seniors, we divide the tickets sold to seniors by the total number of tickets sold to children, adults, and seniors.
This value is multiplied with 100 to convert it into a percentage.
The number of tickets sold to seniors

The total number of tickets sold to children, adults, and seniors

The percentage of tickets sold to seniors

Rounding this off, we get the value as 13.9%
Hence, option 1 is the correct answer.