The Following Argument Is Valid or Forceful

The following argument is valid or forceful. Identify the irrelevant premise: We must abolish fighting in ice hockey. It's barbaric and not essential to the game. Fighting is also dangerous and leads to long term medical and psychological problems for ex-fighters. If part of a sport is dangerous and leads to long term problems for players, then it should be abolished.

A) Fighting causes long term psychological problems for ex-fighters.
B) If part of a sport is dangerous and leads to long term problems for players, then it should be abolished.
C) Fighting is not essential to the game of ice hockey.
D) Fighting is barbaric.