If each participant of a chess tournament plays exactly one game with each of the remaining participants, then 105 games will be played during the tournament. Find the number of participants.  Choose the correct option:	A) 15	B) 16	C) 17	D) 18	E) 19

Rationale: "let p be the number of participants . pc 2 = 105 ( p ) ( p - 1 ) = 210 = 15 * 14 p = 15 the answer is a ."
Answer: A