Answer: B. Darlene and her friends are engaging in concerted activity since they are discussing how to improve working conditions.
Step-by-step explanation:
Concerted Activity refers to activity that employees may engage in when they are trying to improve the conditions at their workplace without fear of Employer retaliation. Federal Law by the National Labor Relations Act protects the ability of workers to be able to meet and discuss how they can improve conditions and Employees do not even have to be in a Union to engage in such.
When engaged in a Concerted action, the employer has no right to in any way threaten your employment.
Darlene and her friends' actions are therefore considered a concerted activity as they are meeting to discuss how to improve a workplace problem.