The correct answer is B) strike; picket
Step-by-step explanation:
Both strike and picket are strategies used by union workers to oppose the actions of employers or work conditions. In strikes, workers refuse to work; due to this, strikes are used to force employers or government to hear the grievances of workers. Additionally, this is considered a last resort because it is only necessary after other methods for negotiation were not answered.
On the other hand, a picket refers to workers gathering with signs to protest certain actions or conditions or to support a strike and make this visible to society. Due to this, pickets are a way to make the actions of workers public. Thus, the words that complete the sentence are strike and picket because a strike involves workers that agree to stop working while a picket means walking outside the workplace with signs.