Which action could indicate a serious issue with a construction worker?

Irregular attendance can signify potential serious issues with a construction worker. When a worker frequently misses shifts, arrives late, or leaves early without a clear reason, it may indicate underlying problems such as personal issues, health concerns, or dissatisfaction with their job. Regular attendance is crucial in construction, where coordination among team members is essential for safety and productivity. Inconsistent presence may disrupt workflow and can increase the risk of accidents or errors, making it a critical point of concern for supervisors and teammates.

The other choices, while they can reflect different aspects of a worker’s behavior or performance, do not necessarily indicate serious issues in the same way. Regular breaks are considered a standard practice for maintaining safety and health during physically demanding tasks. Daily overtime might be a sign of strong work ethic or a response to project demands, but it doesn't immediately suggest a problem. Being overly sociable could indicate strong interpersonal skills, which typically benefit teamwork and morale.