The phrase "draws the line at"(para.2) most probably means______.

A．nothing can be done about violence in sports
B．football players are concerned about violence in sports
C．violence in sports is worse now than it ever was
D．athletes are confused about what should be permitted in sports

A．violence in sports is illegal
B．finesse is more important that aggression
C．athletes should not be injured in sports
D．violence in sports is not necessary