While Building a New Baseball Park in Upper City, the Big

While building a new baseball park in Upper City, the Big League Concrete Company subcontracts with Cushy Seating to install the seats. The construction workers at Big League are represented by the International Union of Stadium Employees (IUSE) . Cushy is a non-union employer and has rebuffed efforts by IUSE to get it to sign a collective bargaining agreement with the union. The IUSE sends email and letters to the workers of Big League asking them not to report to work until Cushy signs a union contract or Big League replaces Cushy with a union subcontractor. The IUSE has committed the unfair labor practice of

A) refusing to bargain with an employer.
B) engaging in a secondary boycott.
C) causing an employer to discriminate against an employee.
D) None of the choices are correct.