Which of the following reflects a sign of potential substance abuse through workplace appearance?

Neglecting personal grooming is a significant indicator of potential substance abuse in the workplace. When an individual who normally maintains a certain level of personal hygiene and grooming begins to neglect these aspects, it can signal a change in behavior that may be associated with substance use. This deterioration in appearance is often due to the individual's preoccupation with their substance use, leading to a decline in their overall self-care and attention to appearance.

In a professional environment, maintaining personal grooming is typically expected, and a shift away from this can raise red flags regarding an employee's wellbeing or capability to fulfill their responsibilities effectively. Recognizing these signs is essential in identifying individuals who may be struggling with substance abuse, as early intervention can lead to the necessary support and resources.

The other options represent behaviors that do not typically correlate with signs of substance abuse. Wearing bright and cheerful clothing, maintaining a professional dress code, and regularly wearing company uniforms may indicate positive or neutral engagement in the workplace rather than potential impairment. Therefore, the choice reflecting neglect of personal grooming stands out as a more relevant sign of possible substance-related issues.