The Labor Market in Major League Baseball Features

The labor market in Major League Baseball features

A) a monopoly by the League in employing professional baseball players that is offset by the players' membership in a labor union.
B) a monopsony by the League in employing professional baseball players that is offset by the players' membership in a labor union.
C) an oligopoly by the League in employing professional baseball players that is offset by an oligopsony by the players in the labor market.
D) monopolistic competition between the teams and professional baseball players.