The correct answer is: C. Steel factory workers.
Steel collar workers are a type of blue-collar worker who works in a steel factory. They are responsible for a variety of tasks, including operating machinery, welding, and inspecting products. Steel collar workers typically have a high school diploma or equivalent, and some may have additional training or certification in a related field.
Office clerks are white-collar workers who work in an office environment. They are responsible for a variety of tasks, including answering phones, filing paperwork, and scheduling appointments. Office clerks typically have a high school diploma or equivalent, and some may have additional training or certification in a related field.
Robots are machines that are capable of carrying out a series of actions automatically. They are often used in manufacturing and other industries to perform tasks that are repetitive or dangerous for humans. Robots are typically programmed by engineers, and they can be controlled remotely or by sensors.
None of the above is not a correct answer.