Which One of the Following Does Not Help to Explain

Which one of the following does not help to explain why union workers receive more fringe benefits than nonunion workers?

A) The unionized firm is willing to pay both higher wages and fringe benefits to avoid the costs of a strike
B) The higher incomes of union workers allow them to "purchase" more fringe benefits
C) Unions are primarily composed of younger workers who have more to gain from long-term compensation such as the kind provided by union pension plans
D) As collective voice institutions,unions may better formulate fringe benefit proposals,inform their membership of their worth,and communicate these desires to the firm