Which of the Following Is an Unfair Labour Practice

Which of the following is an unfair labour practice?

A) A union representative has a conversation with an employee about joining the union.
B) An employee is required to join a union as a condition of employment.
C) An employer pays higher wages as part of its annual wage increase,as a union is trying to organize the employees.
D) An employer threatens to have an employee fired if he joins a union.
E) An employer starts another unrelated business that is non-union,as a union tries to organize the employees at the present location.