From the table, we get that
[tex]90[/tex]students ate hot dogs, and
[tex]120+30+60=210[/tex]did not eat hot dogs.
Therefore, the ratio of the number of students who ate hot dogs and the number of students who did not eat hot dogs is:
[tex]\frac{90}{210}\text{.}[/tex]Simplifying the above fraction is:
[tex]\frac{3}{7}\text{.}[/tex]Answer: Option A.