Answer:
The correct answer is the option A: the employees have engaged in an unfair labor practice strike.
Step-by-step explanation:
To begin with, due to the fact that the union was already establishing the area for the negotiation and they might have planeed obviously to keep trying to increase the situation in their favour then the action taken by the employees was a bit hurry and was obvious that was not thought very well with calm minds and therefore that they engaged in an unfair labor practice strike because they had to be patience and wait for the union to improve the situation for them, because their are the representatives and if the company sees that the workers do not obey to the representatives then the union will lose negotiation power and the situation will get worse for them.