Two Reasons Why a Few Individuals Earn Very High Pay

Two reasons why a few individuals earn very high pay in the sports and entertainment fields are that their

A) marginal productivity is high and entry into those industries is restricted
B) marginal productivity is high and the cross-elasticity of demand between their services and the services of other employees is also high
C) marginal productivity is high and there is open competition for their talents
D) wage elasticity of supply is high and there is open competition for their talents
E) marginal productivity is high and they are prohibited from changing employers