Labor unions can use the power of collective bargaining to negotiate, meaning that they will
a. set fires to factories to get their way
b. pay new workers not to take their jobs
c. use numbers to assert their power to strike
d. ask all workers to work really slowly

Labor unions can use the power of collective bargaining to negotiate, meaning that they will use numbers to assert their power to strike. Collective bargaining is like a compromise both the employees and employer to address certain issues like the employees' wages, benefits, etc. 

The answer would be letter C.