What is indicated by a yellow floor marking?

The correct choice indicates that a yellow floor marking is a visual cue used in workplace environments, often for safety and organization purposes. Yellow typically suggests caution or a need to be aware of the surroundings. In many contexts, a yellow marking may indicate an area that is in progress, suggesting that while work is ongoing, it is not yet completed. This aligns with the idea of indicating a certain percentage of completion, such as 70%.

In contrast, the other choices do not accurately represent the conventional meaning of yellow floor markings in such settings. For instance, markings indicating that a task must start immediately would usually be more urgent, perhaps represented by a different color such as red, which signifies danger or immediate attention. An unsafe area for workers may typically use red or black markings, indicating a clear warning rather than just caution. Lastly, green or a different type of marking is often used to signify that a task is finished and ready for review, rather than yellow, which suggests ongoing activity.