18 chess players take part in a tournament. Every player plays twice with each of his opponents. How many games are to be played?	Choose the correct choice from the following choices
A) 230
B) 274
C) 306
D) 354
E) 424

Rationale: "2 * 18 c 2 = 2 * 153 = 306 the answer is c ."
Answer: C