Provide Solution and choose the letter of the correct answer from the choices below.

7. There are 13 teams in a tournament. Each team is to play with each other only once. What is the minimum number of days can they all play without any team playing more than one game in any day?

A.) 11 B.) 12 C.) 13 D.) 14

8. There are five main roads between the cities A and B, and four between B and C. In how many ways can a person drive from A to C and return going through B on both trips without driving on the same road twice?

A.) 260 B.) 240 C.) 120 D.) 160