Final answer:
While lowering the cup section after the steel locking pin is removed, it is important to hold the steel operating handle with both hands for full control and safety.
Step-by-step explanation:
The student's question relates to what is important while lowering the cup section after the steel locking pin is removed. When conducting any physical experiment or handling equipment, it is crucial to follow proper safety and operation procedures to ensure both personal safety and the integrity of the experiment.
In this scenario, after removing the steel locking pin, it is important to have a firm and controlled grip on the steel operating handle. The procedure outlined for Part (a) does not directly relate to the handling of a steel locking pin or lowering a cup section, but it emphasizes careful handling and manipulation of materials, which is a good practice in all physical experiments.
Therefore, it is likely that the answer to the student's question would be A. That the steel operating handle is held with both hands. This ensures that you have full control over the movement of the cup section and that it is being lowered in a safe and controlled manner.