A worker who continues difficult tasks until they are completed is said to have:

The correct choice is perseverance, which refers to the ability to persist in the face of challenges and maintain effort until a task is completed. This quality is essential in various work environments, especially when tasks become difficult or tedious. A worker demonstrating perseverance remains focused on the goal, overcoming obstacles and setbacks without giving in to frustration or the desire to quit.

While reliability indicates being dependable and consistently producing quality work, it doesn’t specifically highlight the aspect of enduring through tough tasks. Adaptability refers to adjusting to new conditions or changes, which, while important, doesn’t directly capture the concept of seeing a challenging task through to its end. Poise is related to the ability to remain composed and confident in various situations, but it does not imply a proactive effort to complete difficult tasks. Thus, perseverance is the trait most accurately associated with continuing to work through challenges until the job is done.