Erratic sets of rules governing baseball
Inadequacies of the player controlled baseball.
"The creation of the National League took power away from greedy and undependable players, but it placed it in the hands of ruthless capitalist owners".
"The creation of the National League took power away from greedy and undependable players, but it placed it in the hands of ruthless capitalist owners".
The best answer to your question would be (D) but (A) and (C) also played smaller roles in the demise of the National Association of Base Ball Players, which was superseded by the current National League.