In Which Situation Would the Traditional Type of Collective Bargaining

In which situation would the traditional type of collective bargaining (union) help nurses attain their goals?

A) Management has agreed to no nursing layoffs for one year after reorganization.
B) Nursing has received a 4% salary increase this year and next year.
C) Nurses have identified workplace safety issues and health hazards.
D) Management has arranged for nurse practitioners to have admitting privileges.