The correct answer is D. time spent
by workers on their job.Idle time is time spent by workers on their job that is not productive. It can be caused by a number of factors, such as waiting for materials, equipment, or instructions, or by poor work methods. Idle time can lead to lost productivity, increased costs, and employee dissatisfaction.
Option A is incorrect because it refers to time spent by workers in a factory. This time may or may not be productive, depending on the worker’s activities.
Option B is incorrect because it refers to time spent by workers in an office. This time may or may not be productive, depending on the worker’s activities.
Option C is incorrect because it refers to time spent by workers off their work. This time is not considered idle time, as it is not time spent on the job.