Maddie is setting up tables for a party. Five of the tables are covered with orange tablecloths, and ten of the tables are covered with white tablecloths. Guests will be randomly seated at the tables when they arrive. Each table can seat 8 guests.

What is the probability that the first guest to arrive will be seated at a table with an orange tablecloth?
A. 1/2
B. 1/3
C. 1/4
D. 1/8​