There are 8 teams in a certain league and each team plays each of the other teams exactly once. If each game is played by 2 teams, what is the total number of games played? Choose the correct choice from the following choices:
A) 15 B) 16 C) 28 D) 56 E) 64

Rationale: "number of ways 2 teams can be selected out of 8 teams : c 8 / 2 = 8 ∗ 7 / 2 = 28 ans : ' ' c ' '"
Answer: C