Answer:
B, 3 tables.
Explanation:
The ratio of people to table is 5:1 because 5 divided by 1 is 5.
For there to be fifteen people, it still has to be the same answer on the ratio, 5/1.
Since it's 5:1 and 15 is triple of five, you also multiply the other side, the tables, by 3 to get 3 tables.