Final answer:
The correct option is e). The concern caused by Gen-Y employees using social networking tools is lower productivity, as these platforms can be distracting and make disconnecting from work challenging.
Step-by-step explanation:
Among the concerns caused by Generation Y, or Millennials, using social networking tools in the workplace, one significant issue is e. Lower productivity. While social platforms can enhance communication and knowledge sharing, they also pose a risk of distractions. This can lead to employees spending work time on non-work-related activities, which in turn affects their productivity levels negatively. Additionally, the constant connectivity that comes with these tools can make it difficult for employees to disconnect, potentially leading to burnout and decreased focus on tasks at hand.