Among the four listed, it would have to be football
But if roids were ever eliminated from football, ALL of the players would be smaller, slower, softer and less agressive, but they would still be competing against eachother.
But TRACK I think would suffer the most because even though they would be competing aginst eachother, the times would be slower and the distances would be shorter.
Same goes for weightlifting.
Bodybuilding would too, but I don't consider that a real sport, but some kind of strange homo-erotic weirdness